System Views

Greenplum Database provides the following system views:

Summary Views

For more information on summary views, see Summary Views, below.

  • gp_stat_all_indexes_summary
  • gp_stat_all_tables_summary
  • gp_stat_archiver_summary
  • gp_stat_bgwriter_summary
  • gp_stat_database_summary
  • gp_stat_progress_analyze_summary
  • gp_stat_progress_basebackup_summary
  • gp_stat_progress_cluster_summary
  • gp_stat_progress_copy_summary
  • gp_stat_progress_create_index_summary
  • gp_stat_progress_dtx_recovery
  • gp_stat_progress_vacuum_summary
  • gp_stat_slru_summary
  • gp_stat_sys_indexes_summary
  • gp_stat_user_functions_summary
  • gp_stat_user_indexes_summary
  • gp_stat_wal_summary
  • gp_stat_xact_all_tables_summary
  • gp_stat_xact_sys_tables_summary
  • gp_stat_xact_user_functions_summary
  • gp_stat_xact_user_tables_summary
  • gp_statio_all_indexes_summary
  • gp_statio_all_sequences_summary
  • gp_statio_all_tables_summary
  • gp_statio_sys_indexes_summary
  • gp_statio_sys_sequences_summary
  • gp_statio_sys_tables_summary
  • gp_statio_user_indexes_summary
  • gp_statio_user_sequences_summary
  • gp_statio_user_tables_summary

For more information about the standard system views supported in PostgreSQL and Greenplum Database, see the following sections of the PostgreSQL documentation:

gp_backend_memory_contexts

The gp_backend_memory_contexts view is a cluster-wide view that displays the pg_backend_memory_contexts information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
name text The name of the memory context.
ident text Identification information of the memory context. This field is truncated at 1024 bytes.
parent text The name of the parent of this memory context.
level int4 The distance from TopMemoryContext in context tree.
total_bytes int8 The total number of bytes allocated for this memory context.
total_nblocks int8 The total number of blocks allocated for this memory context.
free_bytes int8 Free space in bytes.
free_chunks int8 The total number of free chunks.
used_bytes int8 Used space in bytes.

gp_config

The gp_config view is a cluster-wide view that displays the pg_configinformation from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
name text The parameter name.
setting text The parameter value.

gp_cursors

The gp_cursors view is a cluster-wide view that displays the pg_config information from every primary segment.

name type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
name text The name of the cursor.
statement text The verbatim query string submitted to declare this cursor.
is_holdable boolean true if the cursor is holdable (that is, it can be accessed after the transaction that declared the cursor has committed); false otherwise.

Note Greenplum Database does not support holdable parallel retrieve cursors, this value is always false for such cursors.
is_binary boolean true if the cursor was declared BINARY; false otherwise.
is_scrollable boolean true if the cursor is scrollable (that is, it allows rows to be retrieved in a nonsequential manner); false otherwise.

Note Greenplum Database does not support scrollable cursors, this value is always false.
creation_time timestamptz The time at which the cursor was declared.
is_parallel boolean true if the cursor was declared PARALLEL RETRIEVE; false otherwise.

gp_distributed_log

The gp_distributed_log view contains status information about distributed transactions and their associated local transactions. A distributed transaction is a transaction that involves modifying data on the segment instances. Greenplum's distributed transaction manager ensures that the segments stay in synch. This view allows you to see the status of distributed transactions.

column type references description
segment_id smallint gp_segment_configuration.content The content id of the segment. The coordinator is always -1 (no content).
dbid smallint gp_segment_configuration.dbid The unique id of the segment instance.
distributed_xid xid The global transaction id.
distributed_id text A system assigned ID for a distributed transaction.
status text The status of the distributed transaction (Committed or Aborted).
local_transaction xid The local transaction ID.

gp_distributed_xacts

The gp_distributed_xacts view contains information about Greenplum Database distributed transactions. A distributed transaction is a transaction that involves modifying data on the segment instances. Greenplum's distributed transaction manager ensures that the segments stay in synch. This view allows you to see the currently active sessions and their associated distributed transactions.

column type references description
distributed_xid xid The transaction ID used by the distributed transaction across the Greenplum Database array.
distributed_id text The distributed transaction identifier. It has 2 parts — a unique timestamp and the distributed transaction number.
state text The current state of this session with regards to distributed transactions.
gp_session_id int The ID number of the Greenplum Database session associated with this transaction.
xmin_distributed _snapshot xid The minimum distributed transaction number found among all open transactions when this transaction was started. It is used for MVCC distributed snapshot purposes.

gp_endpoints

The gp_endpoints view lists the endpoints created for all active parallel retrieve cursors declared by the current session user in the current database. When the Greenplum Database superuser accesses this view, it returns a list of all endpoints created for all parallel retrieve cursors declared by all users in the current database.

Endpoints exist only for the duration of the transaction that defines the parallel retrieve cursor, or until the cursor is closed.

name type references description
gp_segment_id integer The QE's endpoint gp_segment_id.
auth_token text The authentication token for a retrieve session.
cursorname text The name of the parallel retrieve cursor.
sessionid integer The identifier of the session in which the parallel retrieve cursor was created.
hostname varchar(64) The name of the host from which to retrieve the data for the endpoint.
port integer The port number from which to retrieve the data for the endpoint.
username text The name of the session user (not the current user); you must initiate the retrieve session as this user.
state text The state of the endpoint; the valid states are:

READY: The endpoint is ready to be retrieved.

ATTACHED: The endpoint is attached to a retrieve connection.

RETRIEVING: A retrieve session is retrieving data from the endpoint at this moment.

FINISHED: The endpoint has been fully retrieved.

RELEASED: Due to an error, the endpoint has been released and the connection closed.
endpointname text The endpoint identifier; you provide this identifier to the RETRIEVE command.

gp_file_settings

The gp_file_settings view is a cluster-wide view that displays the pg_file_settingsinformation from every primary segment.

name type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
sourcefile text Full path name of the configuration file.
sourceline integer Line number within the configuration file where the entry appears.
seqno integer Order in which the entries are processed (1..n).
name text Configuration parameter name.
setting text Value to be assigned to the parameter.
applied boolean True if the value can be applied successfully.
error text If not null, an error message indicating why this entry could not be applied.

gp_pgdatabase

The gp_pgdatabase view displays the status of Greenplum segment instances and whether they are acting as the mirror or the primary. The Greenplum fault detection and recovery utilities use this view internally to identify failed segments.

column type references description
dbid smallint gp_segment_configuration.dbid System-assigned ID. The unique identifier of a segment (or coordinator) instance.
isprimary boolean gp_segment_configuration.role Whether or not this instance is active. Is it currently acting as the primary segment (as opposed to the mirror).
content smallint gp_segment_configuration.content The ID for the portion of data on an instance. A primary segment instance and its mirror will have the same content ID.

For a segment the value is from 0-N-1, where N is the number of segments in Greenplum Database.

For the coordinator, the value is -1.
valid boolean gp_segment_configuration.mode Whether or not this instance is up and the mode is either s (synchronized) or n (not in sync).
definedprimary boolean gp_segment_ configuration.preferred_role Whether or not this instance was defined as the primary (as opposed to the mirror) at the time the system was initialized.

gp_replication_origin_status

The gp_replication_origin_status view is a cluster-wide view that displays the pg_replication_origin_status information from every primary segment.

name type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
local_id oid pg_replication_origin.roident Internal node identifier.
external_id text pg_replication_origin.roname External node identifier.
remote_lsn pg_lsn The origin node's LSN up to which data has been replicated.
local_lsn pg_lsn This node's LSN at which remote_lsn has been replicated. Used to flush commit records before persisting data to disk when using asynchronous commits.

gp_replication_slots

The gp_replication_slots view is a cluster-wide view that displays the pg_replication_slots information from every primary segment.

name type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
slot_name name A unique, cluster-wide identifier for the replication slot.
plugin name The base name of the shared object containing the output plugin this logical slot is using, or null for physical slots.
slot_type text The slot type - physical or logical.
datoid oid pg_database.oid The OID of the database this slot is associated with, or null. Only logical slots have an associated database.
database text pg_database.datname The name of the database this slot is associated with, or null. Only logical slots have an associated database.
temporary boolean True if this is a temporary replication slot. Temporary slots are not saved to disk and are automatically dropped on error or when the session has finished.
active boolean True if this slot is currently actively being used.
active_pid integer The process ID of the session using this slot if the slot is currently actively being used. NULL if inactive.
xmin xid The oldest transaction that this slot needs the database to retain. VACUUM cannot remove tuples deleted by any later transaction.
catalog_xmin xid The oldest transaction affecting the system catalogs that this slot needs the database to retain. VACUUM cannot remove catalog tuples deleted by any later transaction.
restart_lsn pg_lsn The address (LSN) of oldest WAL which still might be required by the consumer of this slot and thus won't be automatically removed during checkpoints. NULL if the LSN of this slot has never been reserved.
confirmed_flush_lsn pg_lsn The address (LSN) up to which the logical slot's consumer has confirmed receiving data. Data older than this is not available anymore. NULL for physical slots.

gp_resgroup_config

The gp_toolkit.gp_resgroup_config view allows administrators to see the current CPU, memory, and concurrency limits for a resource group.

Note

The gp_resgroup_config view is valid only when resource group-based resource management is active.

column type references description
groupid oid pg_resgroup.oid The ID of the resource group.
groupname name pg_resgroup.rsgname The name of the resource group.
concurrency text pg_resgroupcapability.value for pg_resgroupcapability.reslimittype = 1 The concurrency (CONCURRENCY) value specified for the resource group.
cpu_max_percent text pg_resgroupcapability.value for pg_resgroupcapability.reslimittype = 2 The CPU limit (CPU_MAX_PERCENT) value specified for the resource group, or -1.
cpu_weight text pg_resgroupcapability.value for pg_resgroupcapability.reslimittype = 3 The scheduling priority of the resource group (CPU_WEIGHT).
cpuset text pg_resgroupcapability.value for pg_resgroupcapability.reslimittype = 4 The CPU cores reserved for the resource group (CPUSET), or -1.
memory_limit text pg_resgroupcapability.value for pg_resgroupcapability.reslimittype = 5 The memory limit (MEMORY_LIMIT) value specified for the resource group.
min_cost text pg_resgroupcapability.value for pg_resgroupcapability.reslimittype = 6 The minimum cost of a query plan to be included in the resource group (MIN_COST).
io_limit text pg_resgroupcapability.value for pg_resgroupcapability.reslimittype = 7 The maximum read/write sequential disk I/O throughput, and the maximum read/write I/O operations per second for the queries assigned to a specific tablespace (shown as the tablespace oid) and resource group (IO_LIMIT).

gp_resgroup_iostats_per_host

The gp_toolkit.gp_resgroup_iostats_per_host view allows administrators to see current disk I/O usage for each resource group on a per-host basis.

Memory amounts are specified in MBs.

Note

The gp_resgroup_iostats_per_host view is valid only when resource group-based resource management is active.

column type references description
rsgname name pg_resgroup.rsgname The name of the resource group
hostname text gp_segment_configuration.hostname The hostname of the segment host
tablespace name pg_tablespace.spcname The name of the tablespace
rbps bigint The real-time read sequential disk I/O throughput by the resource group on a host, in Bytes/s
wbps bigint The real-time write sequential disk I/O throughput by the resource group on a host, in Bytes/s
riops bigint The real-time read I/O operations per second by the resource group on a host
wiops bigint The real-time write I/O operations per second by the resource group on a host

Sample output for the gp_resgroup_iostats_per_host view:

SELECT * from gp_toolkit.gp_resgroup_iostats_per_host;
 rsgname        | hostname | tablespace       | rbps | wbps | riops | wiops  
----------------+----------+------------------+------------------+------------------+-------------+-------------
 rg_test_group1 | mtspc    | pg_default       | 21356347                | 29369067                | 162           | 36           
 rg_test_group2 | mtspc    | pg_default       | 0                | 0                | 0           | 0           
 rg_test_group3 | mtspc    | pg_default       | 0                | 0                | 0           | 0           
 rg_test_group4 | mtspc    | *                | 0                | 0                | 0           | 0           
 rg_test_group5 | mtspc    | rg_io_limit_ts_1 | 0                | 0                | 0           | 0           
(5 rows)

gp_resgroup_iostats_per_host

The gp_toolkit.gp_resgroup_iostats_per_host view allows administrators to see current disk I/O usage for each resource group on a per-host basis.

Memory amounts are specified in MBs.

Note

The gp_resgroup_iostats_per_host view is valid only when resource group-based resource management is active.

column type references description
rsgname name pg_resgroup.rsgname The name of the resource group.
hostname text gp_segment_configuration.hostname The hostname of the segment host.
tablespace
rbps
`

|cpu_usage|float| |The real-time CPU core usage by the resource group on a host. The value is the sum of the percentages of the CPU cores that are used by the resource group on the host.| |memory_usage|float| |The real-time memory usage of the resource group on each Greenplum Database segment's host, in MB.|

Sample output for the gp_resgroup_iostats_per_host view:

select * from gp_toolkit.gp_resgroup_status_per_host;
 rsgname       | hostname | tablespace | rbps (MB_read/s)
---------------+----------+-----------+--------------
 admin_group   | zero     | pg_default | 80
 default_group | zero     | pg_default | 500
 system_group  | zero     | pg_default | 300
 rg_new_group  | zero     | 
(4 rows)

gp_resgroup_status

The gp_resgroup_status view allows administrators to see status and activity for a resource group. It shows how many queries are waiting to run and how many queries are currently active in the system for each resource group. The view also displays current memory and CPU usage for the resource group.

Note

Resource groups use the Linux control groups (cgroups) configured on the host systems. The cgroups are used to manage host system resources. When resource groups use cgroups that are as part of a nested set of cgroups, resource group limits are relative to the parent cgroup allotment. For information about nested cgroups and Greenplum Database resource group limits, see Using Resource Groups.

This view is accessible to all users.

column type references description
rsgname name pg_resgroup.rsgname The name of the resource group.
groupid oid pg_resgroup.oid The ID of the resource group.
num_running integer The number of transactions currently running in the resource group.
num_queueing integer The number of currently queued transactions for the resource group.
num_queued integer The total number of queued transactions for the resource group since the Greenplum Database cluster was last started, excluding the num_queueing.
num_executed integer The total number of transactions run in the resource group since the Greenplum Database cluster was last started, excluding the num_running.
total_queue_duration interval The total time any transaction was queued since the Greenplum Database cluster was last started.

Sample output for the gp_resgroup_status view:

select * from gp_toolkit.gp_resgroup_status;
 rsgname       | groupid | num_running | num_queueing | num_queued | num_executed | total_queue_duration |
---------------+---------+-------------+--------------+------------+-------------------------------------
 default_group | 6437    | 0           | 0            | 0          | 0            | @ 0                  |
 admin_group   | 6438    | 1           | 0            | 0          | 13           | @ 0                  |
 system_group  | 6441    | 0           | 0            | 0          | 0            | @ 0                  |
(3 rows)

gp_resgroup_status_per_host

The gp_toolkit.gp_resgroup_status_per_host view allows administrators to see current memory and CPU usage and allocation for each resource group on a per-host basis.

Memory amounts are specified in MBs.

Note

The gp_resgroup_status_per_host view is valid only when resource group-based resource management is active.

column type references description
rsgname name pg_resgroup.rsgname The name of the resource group.
groupid oid pg_resgroup.oid The ID of the resource group.
hostname text gp_segment_configuration.hostname The hostname of the segment host.
cpu_usage float The real-time CPU core usage by the resource group on a host. The value is the sum of the percentages of the CPU cores that are used by the resource group on the host.
memory_usage float The real-time memory usage of the resource group on each Greenplum Database segment's host, in MB.

Sample output for the gp_resgroup_status_per_host view:

select * from gp_toolkit.gp_resgroup_status_per_host;
 rsgname       | groupid | hostname | cpu_usage | memory_usage
---------------+---------+----------+-----------+--------------
 admin_group   | 6438    | zero     | 0.07      | 91.92
 default_group | 6437    | zero     | 0.00      | 0.00
 system_group  | 6441    | zero     | 0.02      | 53.04
(3 rows)

gp_resgroup_status_per_segment

The gp_toolkit.gp_resgroup_status_per_segment view allows administrators to see current memory usage usage calculated by vmem tracker and grouped by segment.

Memory amounts are specified in MBs.

Note

The gp_resgroup_status_per_segment view is valid only when resource group-based resource management is active.

column type references description
groupid oid pg_resgroup.oid The ID of the resource group.
groupname name pg_resgroup.rsgname The name of the resource group.
segment_id smallint gp_segment_configuration.content The content ID for a segment instance on the segment host.
vmem_usage The real-time memory usage of the resource group on each segment, in MB.

gp_resqueue_status

The gp_toolkit.gp_resqueue_status view allows administrators to see status and activity for a resource queue. It shows how many queries are waiting to run and how many queries are currently active in the system from a particular resource queue.

Note

The gp_resqueue_status view is valid only when resource queue-based resource management is active.

column type references description
queueid oid gp_toolkit.gp_resqueue_ queueid The ID of the resource queue.
rsqname name gp_toolkit.gp_resqueue_ rsqname The name of the resource queue.
rsqcountlimit real gp_toolkit.gp_resqueue_ rsqcountlimit The active query threshold of the resource queue. A value of -1 means no limit.
rsqcountvalue real gp_toolkit.gp_resqueue_ rsqcountvalue The number of active query slots currently being used in the resource queue.
rsqcostlimit real gp_toolkit.gp_resqueue_ rsqcostlimit The query cost threshold of the resource queue. A value of -1 means no limit.
rsqcostvalue real gp_toolkit.gp_resqueue_ rsqcostvalue The total cost of all statements currently in the resource queue.
rsqmemorylimit real gp_toolkit.gp_resqueue_ rsqmemorylimit The memory limit for the resource queue.
rsqmemoryvalue real gp_toolkit.gp_resqueue_ rsqmemoryvalue The total memory used by all statements currently in the resource queue.
rsqwaiters integer gp_toolkit.gp_resqueue_ rsqwaiter The number of statements currently waiting in the resource queue.
rsqholders integer gp_toolkit.gp_resqueue_ rsqholders The number of statements currently running on the system from this resource queue.

gp_segment_endpoints

The gp_segment_endpoints view lists the endpoints created in the QE for all active parallel retrieve cursors declared by the current session user. When the Greenplum Database superuser accesses this view, it returns a list of all endpoints on the QE created for all parallel retrieve cursors declared by all users.

Endpoints exist only for the duration of the transaction that defines the parallel retrieve cursor, or until the cursor is closed.

column type references description
auth_token text The authentication token for the retrieve session.
databaseid oid The identifier of the database in which the parallel retrieve cursor was created.
senderpid integer The identifier of the process sending the query results.
receiverpid integer The process identifier of the retrieve session that is receiving the query results.
state text The state of the endpoint; the valid states are:

READY: The endpoint is ready to be retrieved.

ATTACHED: The endpoint is attached to a retrieve connection.

RETRIEVING: A retrieve session is retrieving data from the endpoint at this moment.

FINISHED: The endpoint has been fully retrieved.

RELEASED: Due to an error, the endpoint has been released and the connection closed.
gp_segment_id integer The QE's endpoint gp_segment_id.
sessionid integer The identifier of the session in which the parallel retrieve cursor was created.
username text The name of the session user (not the current user); you must initiate the retrieve session as this user.
endpointname text The endpoint identifier; you provide this identifier to the RETRIEVE command.
cursorname text The name of the parallel retrieve cursor.

gp_session_endpoints

The gp_session_endpoints view lists the endpoints created for all active parallel retrieve cursors declared by the current session user in the current session.

Endpoints exist only for the duration of the transaction that defines the parallel retrieve cursor, or until the cursor is closed.

column type references description
gp_segment_id integer The QE's endpoint gp_segment_id.
auth_token text The authentication token for a retrieve session.
cursorname text The name of the parallel retrieve cursor.
sessionid integer The identifier of the session in which the parallel retrieve cursor was created.
hostname varchar(64) The name of the host from which to retrieve the data for the endpoint.
port integer The port number from which to retrieve the data for the endpoint.
username text The name of the session user (not the current user); you must initiate the retrieve session as this user.
state text The state of the endpoint; the valid states are:

READY: The endpoint is ready to be retrieved.

ATTACHED: The endpoint is attached to a retrieve connection.

RETRIEVING: A retrieve session is retrieving data from the endpoint at this moment.

FINISHED: The endpoint has been fully retrieved.

RELEASED: Due to an error, the endpoint has been released and the connection closed.
endpointname text The endpoint identifier; you provide this identifier to the RETRIEVE command.

gp_settings

The gp_settings view is a cluster-wide view that displays the pg_settings information from every primary segment.

name type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
name text Runtime configuration parameter name.
setting text Current value of the parameter.
unit text Implicit unit of the parameter.
category text Logical group of the parameter.
short_desc text A brief description of the parameter.
extra_desc text Additional, more detailed, description of the parameter.
context text Context required to set the parameter's value.
vartype text Parameter type (bool, enum, integer, real, or string)v
source text Source of the current parameter value.v
min_val text Minimum allowed value of the parameter (null for non-numeric values).
max_val text Maximum allowed value of the parameter (null for non-numeric values).
enumvals text[] Permitted values of an enum parameter (null for non-enum values).
boot_val text Parameter value assumed at server startup if the parameter is not otherwise set.
reset_val text Value that RESET would reset the parameter to in the current session.
sourcefile text Configuration file the current value was set in (null for values set from sources other than configuration files, or when examined by a user who is neither a superuser or a member of pg_read_all_settings); helpful when using include directives in configuration files.
sourceline integer Line number within the configuration file the current value was set at (null for values set from sources other than configuration files, or when examined by a user who is neither a superuser or a member of pg_read_all_settings).
pending_restart boolean true if the value has been changed in the configuration file but needs a restart; otherwise false.

gp_suboverflowed_backend

The gp_suboverflowed_backend view allows administrators to identify sessions in which a backend has subtransaction overflows, which can cause query performance degradation in the system, including catalog queries.

column type description
segid integer The id of the segment containing the suboverflowed backend.
pids integer[] A list of the pids of all suboverflowed backends on this segment.

For more information on handling suboverflowed backends to prevent performance issues, see Checking for and Terminating Overflowed Backends.

gp_transaction_log

The gp_transaction_log view contains status information about transactions local to a particular segment. This view allows you to see the status of local transactions.

column type references description
segment_id smallint gp_segment_configuration.content The content id of the segment. The coordinator is always -1 (no content).
dbid smallint gp_segment_configuration.dbid The unique id of the segment instance.
transaction xid The local transaction ID.
status text The status of the local transaction (Committed or Aborted).

gpexpand.expansion_progress

The gpexpand.expansion_progress view contains information about the status of a system expansion operation. The view provides calculations of the estimated rate of table redistribution and estimated time to completion.

Status for specific tables involved in the expansion is stored in gpexpand.status_detail.

column type references description
name text Name for the data field provided. Includes:

Bytes Left

Bytes Done

Estimated Expansion Rate

Estimated Time to Completion

Tables Expanded

Tables Left
value text The value for the progress data. For example: Estimated Expansion Rate - 9.75667095996092 MB/s

gp_stat_activity

The gp_stat_activity view is a cluster-wide view that displays the pg_stat_activity information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
datid oid pg_database.oid Database OID
datname name Database name
pid integer Process ID of this backend
sess_id integer Session ID
usesysid oid pg_authid.oid OID of the user logged into this backend
usename name Name of the user logged into this backend
application_name text Name of the application that is connected to this backend
client_addr inet IP address of the client connected to this backend. If this field is null, it indicates either that the client is connected via a Unix socket on the server machine or that this is an internal process such as autovacuum.
client_hostname text Host name of the connected client, as reported by a reverse DNS lookup of client_addr. This field will only be non-null for IP connections, and only when log_hostname is enabled.
client_port integer TCP port number that the client is using for communication with this backend, or -1 if a Unix socket is used
backend_start timestamptz Time backend process was started
xact_start timestamptz Transaction start time
query_start timestamptz Time query began execution
state_change timestampz Time when the state was last changed
wait_event_type text Type of event for which the backend is waiting
wait_event text Wait event name if backend is currently waiting
state text Current overall state of this backend. Possible values are:

- active: The backend is running a query.

- idle: The backend is waiting for a new client command.

- idle in transaction: The backend is in a transaction, but is not currently running a query.

- idle in transaction (aborted): This state is similar to idle in transaction, except one of the statements in the transaction caused an error.

- fastpath function call: The backend is running a fast-path function.

- disabled: This state is reported if track_activities is deactivated in this backend.
query text Text of this backend's most recent query. If state is active this field shows the currently running query. In all other states, it shows the last query that was run.
rsgid oid pg_resgroup.oid Resource group OID or 0.

See Note.
rsgname text pg_resgroup.rsgname Resource group name or unknown.

See Note.

gp_stat_all_indexes

The gp_stat_all_indexes view is a cluster-wide view that displays the pg_stat_indexes information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
relid oid ID of the table for this index.
indexrelid oid OID of this index.
schemaname name Name of the schema this index is in.
relname name Name of the table for this index.
indexrelname name Name for this index.
idx_scan bigint Number of index scans initiated on this index.
idx_tup_read bigint Number of index entries returned by scans on this index.
idx_tup_fetch bigint Number of live table rows fetched by simple index scans using this index

This system view is summarized in the gp_stat_all_indexes_summary system view.

gp_stat_all_tables

The gp_stat_all_tables view is a cluster-wide view that displays the pg_stat_tables information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
relid oid OID of a table.
schemaname name Name of the schema this table is on.
relname name Name of this table.
seq_scan bigint Number of sequential scans initiated on this table.
seq_tup_read bigint Number of live rows fetched by sequential scans.
idx_scan bigint Number of index scans initiated on this table.
idx_tup_fetch bigint Number of live rows fetched by index scans.
n_tup_ins bigint Number of rows inserted.
n_tup_upd bigint Number of rows updated (includes HOT updated rows).
n_tup_del bigint Number of rows deleted.
n_tup_hot_upd bigint Number of rows HOT updated (that is, with no separate index update required).
n_live_tup bigint Estimated number of live rows.
n_dead_tup bigint Estimated number of dead rows.
n_mod_since_analyze bigint Estimated number of rows modified since this table was last analyzed.
n_ins_since_vacuum bigint Estimated number of rows inserted since this table was last vacuumed.
last_vacuum timestamp with time zone Last time at which this table was manually vacuumed (not counting VACUUM FULL).
last_autovacuum timestamp with time zone Last time at which this table was vacuumed by the autovacuum daemon.
last_analyze timestamp with time zone Last time at which this table was manually analyzed.
last_autoanalyze timestamp with time zone Last time at which this table was analyzed by the autovacuum daemon.
vacuum_count bigint Number of times this table has been manually vacuumed (not counting VACUUM FULL).
autovacuum_count bigint Number of times this table has been vacuumed by the autovacuum daemon.
analyze_count bigint Number of times this table has been manually analyzed.
autoanalyze_count bigint Number of times this table has been analyzed by the autovacuum daemon.

This system view is summarized in the gp_stat_all_tables_summary system view.

gp_stat_archiver

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
archived_count bigint Number of WAL files that have been successfully archived.
last_archived_wal text Name of the WAL file most recently successfully archived.
last_archived_time timestamp with time zone Time of the most recent successful archive operation.
failed_count bigint Number of failed attempts for archiving WAL files.
last_failed_wal timestamp with time zone Name of the WAL file of the most recent failed archival operation.
last_failed_time bigint Time of the most recent failed archival operation.
stats_reset timestamp with time zone Time at which these statistics were last reset.

This system view is summarized in the gp_stat_archiver_summary system view.

gp_stat_bgwriter

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
checkpoints_timed bigint Number of scheduled checkpoints that have been performed.
checkpoints_req bigint Number of requested checkpoints that have been performed.
checkpoint_write_time double precision Total amount of time that has been spent in the portion of checkpoint processing where files are written to disk, in milliseconds.
checkpoint_sync_time double precision Total amount of time that has been spent in the portion of checkpoint processing where files are synchronized to disk, in milliseconds.
buffers_checkpoint bigint Number of buffers written during checkpoints.
buffers_clean bigint Number of buffers written by the background writer.
maxwritten_clean bigint Number of times the background writer stopped a cleaning scan because it had written too many buffers.
buffers_backend bigint Number of buffers written directly by a backend.
buffers_backend_fsync bigint Number of times the background writer stopped a cleaning scan because it had written too many buffers.
buffers_alloc bigint Number of buffers allocated.
stats_reset timestamp with time zone Time at which these statistics were last reset.

This system view is summarized in the gp_stat_bgwriter_summary system view.

gp_stat_database

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
datid oid OID of this database, or 0 for objects belonging to a shared relation.
datname name Name of this database, or NULL for shared objects.
numbackends integer Number of backends currently connected to this database, or NULL for shared objects. This is the only column in this view that returns a value reflecting current state; all other columns return the accumulated values since the last reset.
xact_commit bigint Number of transactions in this database that have been committed.
xact_rollback bigint Number of transactions in this database that have been rolled back.
blks_read bigint Number of disk blocks read in this database.
blks_hit bigint Number of times disk blocks were found already in the buffer cache, so that a read was not necessary (this only includes hits in the PostgreSQL buffer cache, not the operating system's file system cache).
tup_returned bigint Number of live rows fetched by sequential scans and index entries returned by index scans in this database.
tup_fetched bigint Number of live rows fetched by index scans in this database.
tup_inserted bigint Number of rows inserted by queries in this database.
tup_updated bigint Number of rows updated by queries in this database.
tup_deleted bigint bigint Number of rows deleted by queries in this database.
conflicts bigint Number of queries canceled due to conflicts with recovery in this database.
temp_files bigint Number of temporary files created by queries in this database. All temporary files are counted, regardless of why the temporary file was created (for example, sorting or hashing), and regardless of the log_temp_files setting.
temp_bytes bigint Total amount of data written to temporary files by queries in this database. All temporary files are counted, regardless of why the temporary file was created, and regardless of the log_temp_files setting.
deadlocks bigint Number of deadlocks detected in this database.
checksum_failures bigint Number of data page checksum failures detected in this database (or on a shared object), or NULL if data checksums are not enabled.
checksum_last_failure timestamp with time zone Time at which the last data page checksum failure was detected in this database (or on a shared object), or NULL if data checksums are not enabled.
blk_read_time double precision Time spent reading data file blocks by backends in this database, in milliseconds (if track_io_timing is enabled, otherwise zero).
session_time double precision Time spent by database sessions in this database, in milliseconds (note that statistics are only updated when the state of a session changes, so if sessions have been idle for a long time, this idle time won't be included).
active_time double precision Time spent executing SQL statements in this database, in milliseconds (this corresponds to the states active and fastpath function call in pg_stat_activity).
idle_in_transaction_time double precision Time spent idling while in a transaction in this database, in milliseconds (this corresponds to the states idle in transaction and idle in transaction (aborted) in gp_stat_activity)
sessions bigint Total number of sessions established to this database.
sessions_abandoned bigint Number of database sessions to this database that were terminated because connection to the client was lost.
sessions_fatal bigint Number of database sessions to this database that were terminated by fatal errors.
sessions_killed bigint Number of database sessions to this database that were terminated by operator intervention.
stats_reset timestamp with time zone Time at which these statistics were last reset.

This system view is summarized in the gp_stat_database_summary system view.

gp_stat_database_conflicts

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
datid oid OID of a database.
datname name Name of this database.
confl_tablespace bigint Number of queries in this database that have been canceled due to dropped tablespaces.
confl_lock bigint Number of queries in this database that have been canceled due to lock timeouts.
confl_snapshot bigint Number of queries in this database that have been canceled due to old snapshots.
client_port integer Client port number.
confl_bufferpin bigint Number of queries in this database that have been canceled due to pinned buffers.
confl_deadlock bigint Number of queries in this database that have been canceled due to deadlocks.

gp_stat_gssapi

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
pid integer Process ID of a backend.
gss_authenticated boolean boolean True if GSSAPI authentication was used for this connection.
principal text Principal used to authenticate this connection, or NULL if GSSAPI was not used to authenticate this connection. This field is truncated if the principal is longer than NAMEDATALEN (64 characters in a standard build).
encrypted boolean True if GSSAPI encryption is in use on this connection.

gp_stat_operations

The view gp_stat_operations shows details about the last operation performed on a database object (such as a table, index, view or database) or a global object (such as a role).

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
classname text The name of the system table in the pg_catalog schema where the record about this object is stored (pg_class=relations, pg_database=databases,pg_namespace=schemas, pg_authid=roles)
objname name The name of the object.
objid oid The OID of the object.
schemaname name The name of the schema where the object resides.
usestatus text The status of the role who performed the last operation on the object (CURRENT=a currently active role in the system, DROPPED=a role that no longer exists in the system, CHANGED=a role name that exists in the system, but has changed since the last operation was performed).
usename name The name of the role that performed the operation on this object.
actionname name The action that was taken on the object.
subtype text The type of object operated on or the subclass of operation performed.
statime timestamptz The timestamp of the operation. This is the same timestamp that is written to the Greenplum Database server log files in case you need to look up more detailed information about the operation in the logs.

gp_stat_progress_analyze

The gp_stat_progress_analyze view is a cluster-wide view that displays the pg_stat_progress_analyze information from every primary segment for all currently-running ANALYZE operations.

The gp_stat_progress_analyze_summary view aggregates across the Greenplum Database cluster the metrics reported by gp_stat_progress_analyze.

Column Type Description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance. (This column is not present in the gp_stat_progress_analyze_summary view.)
pid integer The process identifier of the backend, or the coordinator process identifier if the gp_stat_progress_analyze_summary view.
datid oid The object identifier of the database to which this backend is connected.
datname name Name of the database to which this backend is connected.
relid oid The object identifier of the table being analyzed.
phase text Current processing phase. Refer to ANALYZE Progress Reporting for detailed information about the phases.
sample_blks_total bigint Total number of heap blocks that will be sampled.
sample_blks_scanned bigint Number of heap blocks scanned.
ext_stats_total bigint Number of extended statistics.
ext_stats_computed bigint Number of extended statistics computed. This counter only advances when the phase is computing extended statistics.
child_tables_total bigint Number of child tables.
child_tables_done bigint Number of child tables scanned. This counter only advances when the phase is acquiring inherited sample rows.
current_child_table_relid oid The object identifier of the child table currently being scanned. This field is only valid when the phase is acquiring inherited sample rows. (This column is not present in the for gp_stat_progress_analyze_summary view.)

gp_stat_progress_basebackup

The gp_stat_progress_basebackup view is a cluster-wide view that displays the pg_stat_progress_basebackup information from every primary segment for all currently-running base backup operations (gprecoverseg).

The gp_stat_progress_basebackup_summary view aggregates across the Greenplum Database cluster the metrics reported by gp_stat_progress_basebackup.

Column Type Description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance. (This column is not present in the gp_stat_progress_basebackup_summary view.)
pid integer The process identifier of a WAL sender process, or the coordinator process identifier if the gp_stat_progress_basebackup_summary view.
phase text Current processing phase. Refer to Base Backup Progress Reporting for detailed information about the phases.
backup_total bigint Total amount of data that will be streamed. This is estimated and reported as of the beginning of streaming database files phase. Note that this is only an approximation since the database may change during streaming database files phase and WAL log may be included in the backup later. This is always the same value as backup_streamed once the amount of data streamed exceeds the estimated total size. NULL if the estimation is disabled in pg_basebackup.
backup_streamed bigint Amount of data streamed. This counter only advances when the phase is streaming database files or transferring wal files.
tablespaces_total bigint Total number of tablespaces that will be streamed.
tablespaces_streamed bigint Number of tablespaces streamed. This counter only advances when the phase is streaming database files.

gp_stat_progress_cluster

The gp_stat_progress_cluster view is a cluster-wide view that displays the pg_stat_progress_cluster information from every primary segment for all currently-running CLUSTER and VACUUM FULL (on a heap table) operations.

The gp_stat_progress_cluster_summary view aggregates across the Greenplum Database cluster the metrics reported by gp_stat_progress_cluster.

Column Type Description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance. (This column is not present in the gp_stat_progress_cluster_summary view.)
pid integer Process identifier of the backend, or the coordinator process identifier if the gp_stat_progress_cluster_summary view.
datid oid The object identifier of the database to which this backend is connected.
datname name Name of the database to which this backend is connected.
relid oid The object identifier of the table being clustered.
command text The name of the command that is running. Either CLUSTER or VACUUM FULL.
phase text Current processing phase. Refer to CLUSTER and VACUUM FULL Progress Reporting for detailed information about the phases.
cluster_index_relid oid If the table is being scanned using an index, this is the object identifier of the index being used; otherwise, it is zero. This field is not applicable to AO/CO tables.
heap_tuples_scanned bigint For heap tables, heap_tuples_scanned records the number of tuples scanned, including both live and dead tuples. For AO tables, heap_tuples_scanned records the number of live tuples scanned, excluding the dead tuples. This counter only advances when the phase is seq scanning append-optimized, seq scanning heap, index scanning heap, or writing new heap. For AO/CO tables, Greenplum converts byte size into equivalent heap blocks in size.
heap_tuples_written bigint Number of tuples written. This counter only advances when the phase is seq scanning heap, index scanning heap, writing new append-optimized, or writing new heap.
heap_blks_total bigint Total number of heap blocks in the table. This number is reported as of the beginning of seq scanning heap. For AO/CO tables, Greenplum converts byte size into equivalent heap blocks in size.
heap_blks_scanned bigint Number of heap blocks scanned. This counter only advances when the phase is seq scanning heap. For AO/CO tables, Greenplum converts byte size into equivalent heap blocks in size.
index_rebuild_count bigint Number of indexes rebuilt. This counter only advances when the phase is rebuilding index, and is not applicable to AO/CO tables.

gp_stat_progress_copy

The gp_stat_progress_copy view is a cluster-wide view that displays the pg_stat_progress_copy information from every primary segment for all currently-running COPY operations.

The gp_stat_progress_copy_summary view aggregates across the Greenplum Database cluster the metrics reported by gp_stat_progress_copy.

Column Type Description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance. (This column is not present in the gp_stat_progress_copy_summary view.)
pid integer Process identifier of the backend, or the coordinator process identifier if the gp_stat_progress_copy_summary view.
datid oid The object identifier of the database to which this backend is connected.
datname name Name of the database to which this backend is connected.
relid oid The object identifier of the table on which the COPY command is executed. It is set to 0 if copying from a SELECT query.
command text The command that is running: COPY FROM, COPY TO, COPY FROM ON SEGMENT, or COPY TO ON SEGMENT.
type text The io type that the data is read from or written to: FILE, PROGRAM, PIPE (for COPY FROM STDIN and COPY TO STDOUT), or CALLBACK (used for example during the initial table synchronization in logical replication).
bytes_processed bigint Number of bytes already processed by COPY command.
bytes_total bigint Size of source file for COPY FROM command in bytes. It is set to 0 if not available.
tuples_processed bigint Number of tuples already processed by COPY command.
tuples_excluded bigint Number of tuples not processed because they were excluded by the WHERE clause of the COPY command.

gp_stat_progress_create_index

The gp_stat_progress_create_index view is a cluster-wide view that displays the pg_stat_progress_create_index information from every primary segment for all currently-running CREATE INDEX and REINDEX operations.

The gp_stat_progress_create_index_summary view aggregates across the Greenplum Database cluster the metrics reported by gp_stat_progress_create_index.

Column Type Description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance. (This column is not present in the gp_stat_progress_create_index_summary view.)
pid integer Process identifier of the backend, or the coordinator process identifier if the gp_stat_progress_create_index_summary view.
datid oid The object identifer of the database to which this backend is connected.
datname name Name of the database to which this backend is connected.
relid oid The object identifer of the table on which the index is being created.
index_relid oid The object identifer of the index being created or reindexed. Because Greenplum Database does not support concurrent (re)indexing, this value is always 0.
command text The name of the command that is running: CREATE INDEX or REINDEX.
phase text Current processing phase of index creation. Refer to CREATE INDEX Progress Reporting for detailed information about the phases.
lockers_total bigint Total number of lockers to wait for, when applicable.
lockers_done bigint Number of lockers already waited for.
current_locker_pid bigint The process identifier of the locker currently being waited for.
blocks_total bigint Total number of blocks to be processed in the current phase.
blocks_done bigint Number of blocks already processed in the current phase.
tuples_total bigint Total number of tuples to be processed in the current phase.
tuples_done bigint Number of tuples already processed in the current phase.
partitions_total bigint When creating an index on a partitioned table, this column is set to the total number of partitions on which the index is to be created. This field is 0 during a REINDEX.
partitions_done bigint When creating an index on a partitioned table, this column is set to the number of partitions on which the index has been completed. This field is 0 during a REINDEX.

gp_stat_progress_dtx_recovery

The gp_stat_progress_dtx_recovery view is a cluster-wide view that displays the progress of the Distributed Transaction (DTX) Recovery process, which runs in the backgroup during Postgres startup.

This view may be useful if a coordinator restart remains in a recovery state for a long time. Greenplum will not accept connections until all "in-doubt" transactions are resolved. In-doubt transactions are transactions that have been prepared but not committed yet. If there were many transactions running before the coordinator restarted, the recovery of the database may take longer than expected, and you may use this view to monitor the current phase of the recovery. Note that in this scenario, as Greenplum is still starting up, you will need to access the database in utility mode to check this view.

|Column|Type|Description| |------|----|-----------| |phase|text | Status of the recovery. The possible values are: 'initializing', 'recovering commited distributed transactions', 'gathering in-doubt transactions', 'aborting in-doubt transactions', 'gathering in-doubt orphaned transactions', and 'managing in-doubt orphaned transactions'.| |recover_commited_dtx_total|integer| Total number of committed transactions found to recover.| |recover_commited_dtx_completed|integer| Number of committed transactions that have been recovered.| | in_doubt_tx_total|integer| Total number of in-doubt transaction found, used in startup and non-startup phases.| |in_doubt_tx_in_progress|integer| Number of in-progress, in-doubt transactions.| |in_doubt_tx_aborted`|integer| Number of aborted in-doubt transactions.|

gp_stat_progress_vacuum

The gp_stat_progress_vacuum view is a cluster-wide view that displays the pg_stat_progress_vacuum information from every primary segment for all currently-running VACUUM and vacuumdb operations.

The gp_stat_progress_vacuum_summary view aggregates across the Greenplum Database cluster the metrics reported by gp_stat_progress_vacuum.

Column Type Description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance. (This column is not present in the gp_stat_progress_vacuum_summary view.)
pid integer Process identifier of the backend, or the coordinator process identifier if the gp_stat_progress_vacuum_summary view.
datid oid The object identifier of the database to which this backend is connected.
datname name Name of the database to which this backend is connected.
relid oid The object identifier of the table being vacuumed.
phase text Current processing phase of vacuum. Refer to VACUUM Progress Reporting for detailed information about the phases.
heap_blks_total bigint Heap tables: Total number of heap blocks in the table. This number is reported as of the beginning of the scan; blocks added later will not be (and need not be) visited by this VACUUM.

AO/CO tables1: Collected at the beginning of the append-optimized pre-cleanup phase by adding up the on-disk file sizes of all segment files of the relation, and converting the size into the number of heap-equivalent blocks. The value should not change while VACUUM progresses.
heap_blks_scanned bigint Heap tables: Number of heap blocks scanned. Because the visibility map is used to optimize scans, some blocks will be skipped without inspection; skipped blocks are included in this total, so that this number will eventually become equal to heap_blks_total when the vacuum is complete. This counter only advances when the phase is scanning heap.

AO/CO tables:1 The counter only advances when the phase is append-optimized compact. For ao_row tables, updated every time Greenplum finishes scanning a segment file. For ao_column tables, updated every time Greenplum moves a tuple. heap_blks_scanned can be less than or equal to heap_blks_total at the end of the VACUUM operation because Greenplum does not need to scan blocks after the logical EOF of a segment file.
heap_blks_vacuumed bigint Heap tables: Number of heap blocks vacuumed. Unless the table has no indexes, this counter only advances when the phase is vacuuming heap. Blocks that contain no dead tuples are skipped, so the counter may sometimes skip forward in large increments.

AO/CO tables1: The counter advances when Greenplum truncates a segment file, which may happen during both append-optimized pre-cleanup and append-optimized post-cleanup phases. Because Greenplum Database truncates physical blocks after the logical EOF in a segment file, heap_blks_vacuumed may be either smaller or larger than heap_blks_scanned.
index_vacuum_count bigint Heap tables: Number of completed index vacuum cycles.

AO/CO tables: Collected when Greenplum recycles a dead segment file, which may happen both, any, or neither, during append-optimized pre-cleanup phase and append-optimized post-cleanup phase.
max_dead_tuples bigint Heap tables: Number of dead tuples that we can store before needing to perform an index vacuum cycle, based on maintenance_work_mem.

AO/CO tables: Collected at the beginning of the append-optimized pre-cleanup phase, this is the total number of tuples before the logical EOF of all segment files. The value should not change while VACUUM progresses.
num_dead_tuples bigint Heap tables: Number of dead tuples collected since the last index vacuum cycle.

AO/CO tables: Collected during append-optimized compact phase. For ao_row tables, updated every time Greenplum discares a dead tuple. For ao_column tables, updated every time Greenplum moves a live tuple, and also when the number of dead tuples advances.

1 In Greenplum Database, an AO/CO table vacuum behaves differently than a heap table vacuum. Because Greenplum stores the logical EOF for each segment file, it does not need to scan physical blocks after the logical EOF, and Greenplum can truncate them. Because of this, for AO/CO tables, heap_blks_vacuumed could be either smaller or larger than heap_blks_scanned. Neither heap_blks_vacuumed nor heap_blks_scanned can be larger than heap_blks_total. Similarly, heap_blks_scanned can be less than or equal to heap_blks_total at the end of VACUUM for AO/CO tables - there is no need to scan blocks after the logical EOF of a segment file.

gp_stat_replication

The gp_stat_replication view contains replication statistics of the walsender process that is used for Greenplum Database Write-Ahead Logging (WAL) replication when coordinator or segment mirroring is enabled.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
pid integer Process ID of the walsender backend process.
usesysid oid User system ID that runs the walsender backend process.
usename name User name that runs the walsender backend process.
application_name text Client application name.
client_addr inet Client IP address.
client_hostname text Client host name.
client_port integer Client port number.
backend_start timestamp Operation start timestamp.
backend_xmin xid The current backend's xmin horizon.
state text walsender state. The value can be:

startup

backup

catchup

streaming
sent_location text walsender xlog record sent location.
write_location text walreceiver xlog record write location.
flush_location text walreceiver xlog record flush location.
replay_location text Coordinator standby or segment mirror xlog record replay location.
sync_priority integer Priority. The value is 1.
sync_state text walsendersynchronization state. The value is sync.
sync_error text walsender synchronization error. none if no error.

gp_stat_resqueues

The gp_stat_resqueues view is a cluster-wide view that displays the pg_stat_resqueues information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
queueid oid The OID of the resource queue.
queuename name The name of the resource queue.
n_queries_exec bigint Number of queries submitted for execution from this resource queue.
n_queries_wait bigint Number of queries submitted to this resource queue that had to wait before they could run.
elapsed_exec bigint Total elapsed execution time for statements submitted through this resource queue.
elapsed_wait bigint Total elapsed time that statements submitted through this resource queue had to wait before they were run.

gp_stat_slru

The gp_stat_slru view is a cluster-wide view that displays the pg_stat_slru information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
name text Name of the SLRU.
blks_zeroed bigint Number of blocks zeroed during initializations.
blks_hit bigint Number of times disk blocks were found already in the SLRU, so that a read was not necessary (this only includes hits in the SLR, not the operating system's file system cache).
blks_read bigint Number of disk blocks read for this SLRU.
blks_written biging Number of disk blocks written for this SLRU.
blks_exists biging Number of blocks checked for existence for this SLRU.
flushes bigint Number of flushes of dirty data for this SLRU.
truncates bigint Number of truncates for this SLRU.
stats_reset timestamp with time zone Time at which these statistics were last reset.

This system view is summarized in the gp_stat_slru_summary system view.

gp_stat_ssl

The gp_stat_ssl view is a cluster-wide view that displays the pg_stat_ssl information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
pid integer Process ID of a backend or WAL sender process.
ssl boolean True if SSL is used on this connection
version text Version of SSL in use, or NULL if SSL is not in use on this connection.
cipher text Name of SSL cipher in use, or NULL if SSL is not in use on this connection.
bits integer Number of bits in the encryption algorithm used, or NULL if SSL is not used on this connection.
client_dn text Distinguished Name (DN) field from the client certificate used, or NULL if no client certificate was supplied or if SSL is not in use on this connection. This field is truncated if the DN field is longer than NAMEDATALEN (64 characters in a standard build).
client_serial numeric Serial number of the client certificate, or NULL if no client certificate was supplied or if SSL is not in use on this connection. The combination of certificate serial number and certificate issuer uniquely identifies a certificate (unless the issuer erroneously reuses serial numbers).
issuer_dn text DN of the issuer of the client certificate, or NULL if no client certificate was supplied or if SSL is not in use on this connection. This field is truncated like client_dn is.

gp_stat_subscription

The gp_stat_subscription view is a cluster-wide view that displays the pg_stat_subscription information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
subid oid OID of the subscription.
subname name Name of the subscription.
pid integer Process ID of the subscription worker process.
relid oid OID of the relation that the worker is synchronizing; NULL for the main apply worker.
received_lsn pg_lsn Last write-ahead log location received, the initial value of this field being 0.
last_msg_send_time timestamp with time zone Send time of last message received from origin WAL sender.
last_msg_receipt_time timestamp with time zone Receipt time of last message received from origin WAL sender.
latest_end_lsn pg_lsn Last write-ahead log location reported to origin WAL sender.
latest_end_time timestamp with time zone Time of last write-ahead log location reported to origin WAL sender.

gp_stat_sys_indexes

The gp_stat_sys_indexes view is a cluster-wide view that displays the pg_stat_sys_indexes information from every primary segment. It shows the same information as gp_stat_all_indexes but filtered to show system indexes only.

This system view is summarized in the gp_stat_sys_indexes_summary system view.

gp_stat_sys_tables

The gp_stat_sys_tables view is a cluster-wide view that displays the pg_stat_sys_tables information from every primary segment. It shows the same information as gp_stat_all_tables but filtered to show system tables only.

gp_stat_user_functions

The gp_stat_user_functions view is a cluster-wide view that displays the pg_stat_user_functions information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
funcid oid OID of a function.
schemaname name Name of the schema this function is in.
funcname name Name of this function.
calls bigint Number of times this function has been called.
total_time double precision Total time spent in this function and all other functions called by it, in milliseconds.
self_time double precision Total time spent in this function itself, not including other functions called by it, in milliseconds.

This system view is summarized in the gp_stat_user_functions_summary system view.

gp_stat_user_indexes

The gp_stat_user_indexes view is a cluster-wide view that displays the pg_stat_user_indexes information from every primary segment. It shows the same information as gp_stat_all_indexes but filtered to show indexes on user tables only.

This system view is summarized in the gp_stat_user_functions_summary system view.

gp_stat_user_tables

The gp_stat_user_tables view is a cluster-wide view that displays the pg_stat_user_tables information from every primary segment. It shows the same information as gp_stat_all_tables but filtered to show only user tables.

gp_stat_wal

The gp_stat_wal view is a cluster-wide view that displays the pg_stat_wal information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
wal_records bigint Total number of WAL records generated.
wal_fpw bigint Total number of WAL full page images generated.
wal_bytes numeric Total amount of WAL generated in bytes.
wal_buffers_full bigint Number of times WAL data was written to disk because WAL buffers became full.
wal_write bigint Number of times WAL buffers were written out to disk.
wal_sync bigint Number of times WAL files were synced to disk.
wal_write_time double precision Total amount of time spent writing WAL buffers to disk, in milliseconds (if track_wal_io_timing is enabled, otherwise zero).
wal_sync_time double precision Total amount of time spent syncing WAL files to disk, in milliseconds (if track_wal_io_timing is enabled, otherwise zero).
stats_reset timestamp with time zone Time at which these statistics were last reset.

This system view is summarized in the gp_stat_wal_summary system view.

gp_stat_wal_receiver

The gp_stat_wal_receiver view is a cluster-wide view that displays the pg_stat_wal_receiver information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
pid integer Process ID of the WAL receiver process.
status text Activity status of the WAL receiver process.
receive_start_lsn pg_lsn First write-ahead log location used when WAL receiver is started.
receive_start_tli integer. First timeline number used when WAL receiver is started.
written_lsn pg_lsn. Last write-ahead log location already received and written to disk, but not flushed. This should not be used for data integrity checks.
flushed_lsn pg_lsn Last write-ahead log location already received and flushed to disk, the initial value of this field being the first log location used when WAL receiver is started.
received_tli integer Timeline number of last write-ahead log location received and flushed to disk, the initial value of this field being the timeline number of the first log location used when WAL receiver is started.
last_msg_send_time timestamp with time zone Send time of last message received from origin WAL sender.
last_msg_receipt_time timestamp with time zone Receipt time of last message received from origin WAL sender.
latest_end_lsn pg_lsn Last write-ahead log location reported to origin WAL sender.
latest_end_time timestamp with time zone Time of last write-ahead log location reported to origin WAL sender.
slot_name text Replication slot name used by this WAL receiver.
sender_host text Host of the PostgreSQL instance this WAL receiver is connected to. This can be a host name, an IP address, or a directory path if the connection is via Unix socket. (The path case can be distinguished because it will always be an absolute path, beginning with /.).
sender_port integer Port number of the PostgreSQL instance this WAL receiver is connected to.
conninfo text Connection string used by this WAL receiver, with security-sensitive fields obfuscated.

gp_stat_xact_all_tables

The gp_stat_xact_all_tables view is a cluster-wide view that displays the pg_stat_xact_all_tables information from every primary segment. It shows the same information as gp_stat_all_tables but counts actions taken so far within the current transaction (which are not yet included in gp_stat_all_tables and related views). The columns for numbers of live and dead rows and vacuum and analyze actions are not present in this view.

This system view is summarized in the gp_stat_xact_all_tables_summary system view.

gp_stat_xact_sys_tables

The gp_stat_xact_sys_tables view is a cluster-wide view that displays the pg_stat_xact_sys_tables information from every primary segment. It shows the same information as gp_stat_xact_all_tables but filtered to show system tables only.

This system view is summarized in the gp_stat_xact_sys_tables_summary system view.

gp_stat_xact_user_functions

The gp_stat_xact_user_functions view is a cluster-wide view that displays the pg_stat_xact_user_functions information from every primary segment. It shows the same information as gp_stat_xact_user_functions but counts only calls during the current transaction (which are not yet included in gp_stat_user_functions).

This system view is summarized in the gp_stat_xact_user_functions_summary system view.

gp_stat_xact_user_tables

The gp_stat_xact_user_tables view is a cluster-wide view that displays the pg_stat_xact_user_tables information from every primary segment. It shows the same information as gp_stat_xact_all_tables but filtered to show user tables only.

This system view is summarized in the gp_stat_xact_user_tables_summary system view.

gp_statio_all_indexes

The gp_statio_all_indexes view is a cluster-wide view that displays the pg_statio_all_indexes information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
relid oid OID of the table for this index.
indexrelid oid OID of this index.
schemaname name Name of the schema containing this index.
relname name Name of the table for this index.
indexrelname name Name of this index.
idx_blks_read bigint Number of disk blocks read from this index.
idx_blks_hit bigint Number of buffer hits in this index.

This system view is summarized in the gp_statio_all_indexes_summary system view.

gp_statio_all_sequences

The gp_statio_all_sequences view is a cluster-wide view that displays the pg_statio_all_sequences information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator) instance.
relid oid OID of a sequence.
schemaname name Name of the schema this sequence is in.
relname name Name of this sequence.
blks_read bigint Number of disk blocks read from this sequence.
blks_hit bigint Number of buffer hits in this sequence.

This system view is summarized in the gp_statio_all_sequences_summary system view.

gp_statio_all_tables

The gp_statio_all_tables view is a cluster-wide view that displays the pg_statio_all_tables information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator)
reli oid OID of a table.
schemaname name Name of the schema containing this table.
relname name Name of this table.
heap_blks_read bigint Number of disk blocks read from this table.
heap_blks_hit bigint Number of buffer hits in this table.
idx_blks_read bigint Number of disk blocks read from all indexes on this table.
idx_blks_hit bigint Number of buffer hits in all indexes on this table.
toast_blks_read bigint. Number of disk blocks read from this table's TOAST table (if any).
toast_blks_hit bigint Number of buffer hits in this table's TOAST table (if any).
tidx_blks_read bigint Number of disk blocks read from this table's TOAST table indexes (if any).
tidx_blks_hit bigint Number of buffer hits in this table's TOAST table indexes (if any).

This system view is summarized in the gp_statio_all_tables_summary system view.

gp_statio_sys_indexes

The gp_statio_sys_indexes view is a cluster-wide view that displays the pg_statio_sys_indexes information from every primary segment. It shows the same information as gp_statio_all_indexes but filtered to show indexes on system tables only.

This system view is summarized in the gp_statio_sys_indexes_summary system view.

gp_statio_sys_sequences

The gp_statio_sys_sequences view is a cluster-wide view that displays the pg_statio_sys_sequences information from every primary segment. It shows the same information as gp_statio_all_sequences but filtered to system sequences only.

This system view is summarized in the gp_statio_sys_indexes_summary system view.

gp_statio_sys_tables

The gp_statio_sys_tables view is a cluster-wide view that displays the pg_statio_sys_tables information from every primary segment. It shows the same information as gp_statio_all_tables but filtered to show system tables only.

This system view is summarized in the gp_statio_sys_tables_summary system view.

gp_statio_user_indexes

The gp_statio_user_indexes view is a cluster-wide view that displays the pg_statio_user_indexes information from every primary segment. It shows the same information as gp_statio_all_indexes but filtered to show indexes on user tables only.

This system view is summarized in the gp_statio_sys_user_indexes_summary system view.

gp_statio_user_sequences

The gp_statio_user_sequences view is a cluster-wide view that displays the pg_statio_user_sequences information from every primary segment. It shows the same information as gp_statio_all_sequences but filtered to show user sequences only.

This system view is summarized in the gp_statio_sys_user_sequences_summary system view.

gp_statio_user_tables

The gp_statio_user_tables view is a cluster-wide view that displays the pg_statio_user_tables information from every primary segment. It shows the same information as gp_statio_all_tables but filtered to show user tables only.

This system view is summarized in the gp_statio_sys_user_tables_summary system view.

gp_stats

The gp_stats view is a cluster-wide view that displays the pg_stats information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator)
schemaname name pg_namespace.nspname The name of the schema containing table.
tablename name pg_class.relname The name of the table.
attname name pg_attribute.attname The name of the column described by this row.
inherited bool If true, this row includes inheritance child columns, not just the values in the specified table.
null_frac real The fraction of column entries that are null.
avg_width integer The average width in bytes of column's entries.
n_distinct real If greater than zero, the estimated number of distinct values in the column. If less than zero, the negative of the number of distinct values divided by the number of rows. (The negated form is used when ANALYZE believes that the number of distinct values is likely to increase as the table grows; the positive form is used when the column seems to have a fixed number of possible values.) For example, -1 indicates a unique column in which the number of distinct values is the same as the number of rows.
most_common_vals anyarray A list of the most common values in the column. (Null if no values seem to be more common than any others.)
most_common_freqs real[] A list of the frequencies of the most common values, i.e., number of occurrences of each divided by total number of rows. (Null when most_common_vals is.)
histogram_bounds anyarray A list of values that divide the column's values into groups of approximately equal population. The values in most_common_vals, if present, are omitted from this histogram calculation. (This column is null if the column data type does not have a < operator or if the most_common_vals list accounts for the entire population.)
correlation real Statistical correlation between physical row ordering and logical ordering of the column values. This ranges from -1 to +1. When the value is near -1 or +1, an index scan on the column will be estimated to be cheaper than when it is near zero, due to reduction of random access to the disk. (This column is null if the column data type does not have a < operator.)
most_common_elems anyarray A list of non-null element values most often appearing within values of the column. (Null for scalar types.)
most_common_elem_freqs real[] A list of the frequencies of the most common element values, i.e., the fraction of rows containing at least one instance of the given value. Two or three additional values follow the per-element frequencies; these are the minimum and maximum of the preceding per-element frequencies, and optionally the frequency of null elements. (Null when most_common_elems is.)
element_count_histogram real[] A histogram of the counts of distinct non-null element values within the values of the column, followed by the average number of distinct non-null elements. (Null for scalar types.)

The maximum number of entries in the array fields can be controlled on a column-by-column basis using the ALTER TABLE SET STATISTICS command, or globally by setting the default_statistics_target run-time configuration parameter.

gp_stats_ext

The gp_stats_ext view is a cluster-wide view that displays the pg_stats_ext information from every primary segment.

column type references description
gp_segment_id integer Unique identifier of a segment (or coordinator)
schemaname name pg_namespace.nspname The name of the schema containing table.
tablename name pg_class.relname The name of the table.
statistics_schemaname name pg_namespace.nspname The name of the schema containing the extended statistic.
statistics_name name pg_statistic_ext.stxname The name of the extended statistic.
statistics_owner oid pg_authid.oid The owner of the extended statistic.
attnames name[] pg_attribute.attname The names of the columns on which the extended statistics is defined.
kinds text[] The types of extended statistics enabled for this record.
n_distinct pg_ndistinct N-distinct counts for combinations of column values. If greater than zero, the estimated number of distinct values in the combination. If less than zero, the negative of the number of distinct values divided by the number of rows. (The negated form is used when ANALYZE believes that the number of distinct values is likely to increase as the table grows; the positive form is used when the column seems to have a fixed number of possible values.) For example, -1 indicates a unique combination of columns in which the number of distinct combinations is the same as the number of rows.
dependencies pg_dependencies Functional dependency statistics.
most_common_vals anyarray A list of the most common values in the column. (Null if no combinations seem to be more common than any others.)
most_common_vals_null anyarray A list of NULL flags for the most combinations of values. (Null when most_common_vals is.)
most_common_freqs real[] A list of the frequencies of the most common combinations, i.e., number of occurrences of each divided by total number of rows. (Null when most_common_vals is.)
most_common_base_freqs real[] A list of the base frequencies of the most common combinations, i.e., product of per-value frequencies. (Null when most_common_vals is.)

The maximum number of entries in the array fields can be controlled on a column-by-column basis using the ALTER TABLE SET STATISTICS command, or globally by setting the default_statistics_target run-time configuration parameter.

pg_backend_memory_contexts

The pg_backend_memory_contexts system view displays all of the memory contexts in use by the server process attached to the current session.

pg_backend_memory_contexts contains one row for each memory context.

column type description
name text The name of the memory context.
ident text Identification information of the memory context. This field is truncated at 1024 bytes.
parent text The name of the parent of this memory context.
level int4 The distance from TopMemoryContext in context tree.
total_bytes int8 The total number of bytes allocated for this memory context.
total_nblocks int8 The total number of blocks allocated for this memory context.
free_bytes int8 Free space in bytes.
free_chunks int8 The total number of free chunks.
used_bytes int8 Used space in bytes.

pg_cursors

The pg_cursors view lists the currently available cursors. Cursors can be defined in one of the following ways:

  • via the DECLARE SQL statement

  • via the Bind message in the frontend/backend protocol

  • via the Server Programming Interface (SPI)

    Note

    Greenplum Database does not support the definition, or access of, parallel retrieve cursors via SPI.

Cursors exist only for the duration of the transaction that defines them, unless they have been declared WITH HOLD. Non-holdable cursors are only present in the view until the end of their creating transaction.

Note

Greenplum Database does not support holdable parallel retrieve cursors.

name type references description
name text The name of the cursor.
statement text The verbatim query string submitted to declare this cursor.
is_holdable boolean true if the cursor is holdable (that is, it can be accessed after the transaction that declared the cursor has committed); false otherwise.

> Note Greenplum Database does not support holdable parallel retrieve cursors, this value is always false for such cursors.
is_binary boolean true if the cursor was declared BINARY; false otherwise.
is_scrollable boolean true if the cursor is scrollable (that is, it allows rows to be retrieved in a nonsequential manner); false otherwise.

> Note Greenplum Database does not support scrollable cursors, this value is always false.
creation_time timestamptz The time at which the cursor was declared.
is_parallel boolean true if the cursor was declared PARALLEL RETRIEVE; false otherwise.

pg_exttable

The pg_exttable system catalog view is used to track external tables and web tables created by the CREATE EXTERNAL TABLE command.

column type references description
reloid oid pg_class.oid The OID of this external table.
urilocation text[] The URI location(s) of the external table files.
execlocation text[] The ON segment locations defined for the external table.
fmttype char Format of the external table files: t for text, c for csv, or b for custom.
fmtopts text Formatting options of the external table files, such as the field delimiter, null string, escape character, etc.
options text[] The options defined for the external table.
command text The OS command to run when the external table is accessed.
rejectlimit integer The per segment reject limit for rows with errors, after which the load will fail.
rejectlimittype char Type of reject limit threshold: r for number of rows, or p for percent.
logerrors bool 1 to log errors, 0 to not.
encoding text The client encoding.
writable boolean false for readable external tables, true for writable external tables.

pg_matviews

The view pg_matviews provides access to information about each materialized view in the database.

column type references description
schemaname name pg_namespace.nspname Name of the schema containing the materialized view
matviewname name pg_class.relname Name of the materialized view
matviewowner name pg_authid.rolname Name of the materialized view's owner
tablespace name pg_tablespace.spcname Name of the tablespace containing the materialized view (NULL if default for the database)
hasindexes boolean True if the materialized view has (or recently had) any indexes
ispopulated boolean True if the materialized view is currently populated
definition text Materialized view definition (a reconstructed SELECT command)

pg_max_external_files

The pg_max_external_files view shows the maximum number of external table files allowed per segment host when using the external table file protocol.

column type references description
hostname name The host name used to access a particular segment instance on a segment host.
maxfiles bigint Number of primary segment instances on the host.

pg_policies

The pg_policies view provides access to information about each row-level security policy in the database.

Column Name Type References Description
schemaname name pg_namespace.nspname The name of schema that contas the table the policy is on
tablename name pg_class.relname The name of the table the policy is on
policyname name pg_policy.polname The name of policy
polpermissive text Is the policy permissive or restrictive?
roles name[] The roles to which this policy applies
cmd text The command type to which the policy is applied
qual text The expression added to the security barrier qualifications for queries to which this policy applies
with_check text The expression added to the WITH CHECK qualifications for queries that attempt to add rows to this table
Note

Policies stored in pg_policy are applied only when pg_class.relrowsecurity is set for their table.

pg_resqueue_attributes

Note

The pg_resqueue_attributes view is valid only when resource queue-based resource management is active.

The pg_resqueue_attributes view allows administrators to see the attributes set for a resource queue, such as its active statement limit, query cost limits, and priority.

column type references description
rsqname name pg_resqueue.rsqname The name of the resource queue.
resname text The name of the resource queue attribute.
resetting text The current value of a resource queue attribute.
restypid integer System assigned resource type id.

pg_stat_activity

The pg_stat_activity view shows one row per server process with details about the associated user session and query. The columns that report data on the current query are available unless the parameter stats_command_string has been turned off. Furthermore, these columns are only visible if the user examining the view is a superuser or the same as the user owning the process being reported on.

The maximum length of the query text string stored in the column query can be controlled with the server configuration parameter track_activity_query_size.

column type references description
datid oid pg_database.oid Database OID
datname name Database name
pid integer Process ID of this backend
sess_id integer Session ID
usesysid oid pg_authid.oid OID of the user logged into this backend
usename name Name of the user logged into this backend
application_name text Name of the application that is connected to this backend
client_addr inet IP address of the client connected to this backend. If this field is null, it indicates either that the client is connected via a Unix socket on the server machine or that this is an internal process such as autovacuum.
client_hostname text Host name of the connected client, as reported by a reverse DNS lookup of client_addr. This field will only be non-null for IP connections, and only when log_hostname is enabled.
client_port integer TCP port number that the client is using for communication with this backend, or -1 if a Unix socket is used
backend_start timestamptz Time backend process was started
xact_start timestamptz Transaction start time
query_start timestamptz Time query began execution
state_change timestampz Time when the state was last changed
wait_event_type text Type of event for which the backend is waiting
wait_event text Wait event name if backend is currently waiting
state text Current overall state of this backend. Possible values are:

- active: The backend is running a query.

- idle: The backend is waiting for a new client command.

- idle in transaction: The backend is in a transaction, but is not currently running a query.

- idle in transaction (aborted): This state is similar to idle in transaction, except one of the statements in the transaction caused an error.

- fastpath function call: The backend is running a fast-path function.

- disabled: This state is reported if track_activities is deactivated in this backend.
backend_xid xid The top-level transaction identifier of this backend, if any.
backend_xmin xid The current backend's xmin horizon.
query text Text of this backend's most recent query. If state is active this field shows the currently running query. In all other states, it shows the last query that was run.
backend_type text The type of the current backend.
rsgid oid pg_resgroup.oid Resource group OID or 0.

See Note.
rsgname text pg_resgroup.rsgname Resource group name or unknown.

See Note.
Note

When resource groups are enabled. Only query dispatcher (QD) processes will have a rsgid and rsgname. Other server processes such as a query executer (QE) process or session connection processes will have a rsgid value of 0 and a rsgname value of unknown. QE processes are managed by the same resource group as the dispatching QD process.

pg_stat_all_indexes

The pg_stat_all_indexes view shows one row for each index in the current database that displays statistics about accesses to that specific index.

The pg_stat_user_indexes and pg_stat_sys_indexes views contain the same information, but filtered to only show user and system indexes respectively.

Column Type Description
relid oid OID of the table for this index
indexrelid oid OID of this index
schemaname name Name of the schema this index is in
relname name Name of the table for this index
indexrelname name Name of this index
idx_scan bigint Total number of index scans initiated on this index from all segment instances
idx_tup_read bigint Number of index entries returned by scans on this index
idx_tup_fetch bigint Number of live table rows fetched by simple index scans using this index

pg_stat_all_tables

The pg_stat_all_tables view shows one row for each table in the current database (including TOAST tables) to display statistics about accesses to that specific table.

The pg_stat_user_tables and pg_stat_sys_table views contain the same information, but filtered to only show user and system tables respectively.

Column Type Description
relid oid OID of a table
schemaname name Name of the schema that this table is in
relname name Name of this table
seq_scan bigint Total number of sequential scans initiated on this table from all segment instances
seq_tup_read bigint Number of live rows fetched by sequential scans
idx_scan bigint Total number of index scans initiated on this table from all segment instances
idx_tup_fetch bigint Number of live rows fetched by index scans
n_tup_ins bigint Number of rows inserted
n_tup_upd bigint Number of rows updated (includes HOT updated rows)
n_tup_del bigint Number of rows deleted
n_tup_hot_upd bigint Number of rows HOT updated (i.e., with no separate index update required)
n_live_tup bigint Estimated number of live rows
n_dead_tup bigint Estimated number of dead rows
n_mod_since_analyze bigint Estimated number of rows modified since this table was last analyzed
last_vacuum timestamp with time zone Last time this table was manually vacuumed (not counting VACUUM FULL)
last_autovacuum timestamp with time zone Last time this table was vacuumed by the autovacuum daemon
last_analyze timestamp with time zone Last time this table was manually analyzed
last_autoanalyze timestamp with time zone Last time this table was analyzed by the autovacuum daemon
vacuum_count bigint Number of times this table has been manually vacuumed (not counting VACUUM FULL)
autovacuum_count bigint Number of times this table has been vacuumed by the autovacuum daemon
analyze_count bigint Number of times this table has been manually analyzed
autoanalyze_count bigint Number of times this table has been analyzed by the autovacuum daemon

pg_stat_operations

The view pg_stat_operations shows details about the last operation performed on a database object (such as a table, index, view or database) or a global object (such as a role).

column type references description
classname text The name of the system table in the pg_catalog schema where the record about this object is stored (pg_class=relations, pg_database=databases,pg_namespace=schemas, pg_authid=roles)
objname name The name of the object.
objid oid The OID of the object.
schemaname name The name of the schema where the object resides.
usestatus text The status of the role who performed the last operation on the object (CURRENT=a currently active role in the system, DROPPED=a role that no longer exists in the system, CHANGED=a role name that exists in the system, but has changed since the last operation was performed).
usename name The name of the role that performed the operation on this object.
actionname name The action that was taken on the object.
subtype text The type of object operated on or the subclass of operation performed.
statime timestamptz The timestamp of the operation. This is the same timestamp that is written to the Greenplum Database server log files in case you need to look up more detailed information about the operation in the logs.

pg_stat_replication

The pg_stat_replication view contains metadata of the walsender process that is used for Greenplum Database coordinator mirroring.

column type references description
pid integer Process ID of WAL sender backend process.
usesysid integer User system ID that runs the WAL sender backend process
usename name User name that runs WAL sender backend process.
application_name oid Client application name.
client_addr name Client IP address.
client_hostname text The host name of the client machine.
client_port integer Client port number.
backend_start timestamp Operation start timestamp.
backend_xmin xid The current backend's xmin horizon.
state text WAL sender state. The value can be:

startup

backup

catchup

streaming
sent_location text WAL sender xlog record sent location.
write_location text WAL receiver xlog record write location.
flush_location text WAL receiver xlog record flush location.
replay_location text Standby xlog record replay location.
sync_priority text Priority. the value is 1.
sync_state text WAL sender synchronization state. The value is sync.

pg_stat_resqueues

Note

The pg_stat_resqueues view is valid only when resource queue-based resource management is active.

The pg_stat_resqueues view allows administrators to view metrics about a resource queue's workload over time. To allow statistics to be collected for this view, you must enable the stats_queue_level server configuration parameter on the Greenplum Database coordinator instance. Enabling the collection of these metrics does incur a small performance penalty, as each statement submitted through a resource queue must be logged in the system catalog tables.

column type references description
queueid oid The OID of the resource queue.
queuename name The name of the resource queue.
n_queries_exec bigint Number of queries submitted for execution from this resource queue.
n_queries_wait bigint Number of queries submitted to this resource queue that had to wait before they could run.
elapsed_exec bigint Total elapsed execution time for statements submitted through this resource queue.
elapsed_wait bigint Total elapsed time that statements submitted through this resource queue had to wait before they were run.

pg_stat_slru

Greenplum Database accesses certain on-disk information via SLRU (simple least-recently-used) caches. The pg_stat_slru view contains one row for each tracked SLRU cache, showing statistics about access to cached pages.

column type references description
name text Name of the SLRU.
blks_zeroed bigint Number of blocks zeroed during initializations.
blks_hit bigint Number of times disk blocks were found already in the SLRU, so that a read was not necessary (this only includes hits in the SLR, not the operating system's file system cache).
blks_read bigint Number of disk blocks read for this SLRU.
blks_written biging Number of disk blocks written for this SLRU.
blks_exists biging Number of blocks checked for existence for this SLRU.
flushes bigint Number of flushes of dirty data for this SLRU.
truncates bigint Number of truncates for this SLRU.
stats_reset timestamp with time zone Time at which these statistics were last reset.

pg_stat_wal

The pg_stat_wal view shows data about the WAL activity of the cluster. It contains always a single row.

column type references description
wal_records bigint Total number of WAL records generated.
wal_fpw bigint Total number of WAL full page images generated.
wal_bytes numeric Total amount of WAL generated in bytes.
wal_buffers_full bigint Number of times WAL data was written to disk because WAL buffers became full.
wal_write bigint Number of times WAL buffers were written out to disk.
wal_sync bigint Number of times WAL files were synced to disk.
wal_write_time double precision Total amount of time spent writing WAL buffers to disk, in milliseconds (if track_wal_io_timing is enabled, otherwise zero).
wal_sync_time double precision Total amount of time spent syncing WAL files to disk, in milliseconds (if track_wal_io_timing is enabled, otherwise zero).
stats_reset timestamp with time zone Time at which these statistics were last reset.

pg_stats

The pg_stats view provides access to the information stored in the pg_statistic catalog. This view allows access only to rows of pg_statistic that correspond to tables the user has permission to read, and therefore it is safe to allow public read access to this view.

pg_stats is also designed to present the information in a more readable format than the underlying catalog — at the cost that its schema must be extended whenever new slot types are defined for pg_statistic.

column type references description
schemaname name pg_namespace.nspname The name of the schema containing table.
tablename name pg_class.relname The name of the table.
attname name pg_attribute.attname The name of the column described by this row.
inherited bool If true, this row includes inheritance child columns, not just the values in the specified table.
null_frac real The fraction of column entries that are null.
avg_width integer The average width in bytes of column's entries.
n_distinct real If greater than zero, the estimated number of distinct values in the column. If less than zero, the negative of the number of distinct values divided by the number of rows. (The negated form is used when ANALYZE believes that the number of distinct values is likely to increase as the table grows; the positive form is used when the column seems to have a fixed number of possible values.) For example, -1 indicates a unique column in which the number of distinct values is the same as the number of rows.
most_common_vals anyarray A list of the most common values in the column. (Null if no values seem to be more common than any others.)
most_common_freqs real[] A list of the frequencies of the most common values, i.e., number of occurrences of each divided by total number of rows. (Null when most_common_vals is.)
histogram_bounds anyarray A list of values that divide the column's values into groups of approximately equal population. The values in most_common_vals, if present, are omitted from this histogram calculation. (This column is null if the column data type does not have a < operator or if the most_common_vals list accounts for the entire population.)
correlation real Statistical correlation between physical row ordering and logical ordering of the column values. This ranges from -1 to +1. When the value is near -1 or +1, an index scan on the column will be estimated to be cheaper than when it is near zero, due to reduction of random access to the disk. (This column is null if the column data type does not have a < operator.)
most_common_elems anyarray A list of non-null element values most often appearing within values of the column. (Null for scalar types.)
most_common_elem_freqs real[] A list of the frequencies of the most common element values, i.e., the fraction of rows containing at least one instance of the given value. Two or three additional values follow the per-element frequencies; these are the minimum and maximum of the preceding per-element frequencies, and optionally the frequency of null elements. (Null when most_common_elems is.)
element_count_histogram real[] A histogram of the counts of distinct non-null element values within the values of the column, followed by the average number of distinct non-null elements. (Null for scalar types.)

The maximum number of entries in the array fields can be controlled on a column-by-column basis using the ALTER TABLE SET STATISTICS command, or globally by setting the default_statistics_target run-time configuration parameter.

pg_stats_ext

The pg_stats view provides access to the information stored in the pg_statistic_ext and pg_statistic_ext_data catalog tables. This view allows access only to rows of pg_statistic_ext and pg_statistic_ext_data that correspond to tables the user has permission to read, and therefore it is safe to allow public read access to this view.

pg_stats_ext is also designed to present the information in a more readable format than the underlying catalogs — at the cost that its schema must be extended whenever new types of extended statistics are added to pg_statistic_ext.

column type references description
schemaname name pg_namespace.nspname The name of the schema containing table.
tablename name pg_class.relname The name of the table.
statistics_schemaname name pg_namespace.nspname The name of the schema containing the extended statistic.
statistics_name name pg_statistic_ext.stxname The name of the extended statistic.
statistics_owner oid pg_authid.oid The owner of the extended statistic.
attnames name[] pg_attribute.attname The names of the columns on which the extended statistics is defined.
kinds text[] The types of extended statistics enabled for this record.
n_distinct pg_ndistinct N-distinct counts for combinations of column values. If greater than zero, the estimated number of distinct values in the combination. If less than zero, the negative of the number of distinct values divided by the number of rows. (The negated form is used when ANALYZE believes that the number of distinct values is likely to increase as the table grows; the positive form is used when the column seems to have a fixed number of possible values.) For example, -1 indicates a unique combination of columns in which the number of distinct combinations is the same as the number of rows.
dependencies pg_dependencies Functional dependency statistics.
most_common_vals anyarray A list of the most common values in the column. (Null if no combinations seem to be more common than any others.)
most_common_vals_null anyarray A list of NULL flags for the most combinations of values. (Null when most_common_vals is.)
most_common_freqs real[] A list of the frequencies of the most common combinations, i.e., number of occurrences of each divided by total number of rows. (Null when most_common_vals is.)
most_common_base_freqs real[] A list of the base frequencies of the most common combinations, i.e., product of per-value frequencies. (Null when most_common_vals is.)

The maximum number of entries in the array fields can be controlled on a column-by-column basis using the ALTER TABLE SET STATISTICS command, or globally by setting the default_statistics_target run-time configuration parameter.

Summary Views

Greenplum Database includes a number of summary views -- all related to collected statistics -- which aggregate across the Greenplum cluster the metrics reported by their corresponding gp_ view. For example, gp_stat_archiver_summary aggregates the metrics reported by gp_stat_archiver. These metrics are reported as sum, average, or last, depending on the column. For more information, see the summary view code in Github.

The following is a list of summary views:

  • gp_stat_all_indexes_summary
  • gp_stat_all_tables_summary
  • gp_stat_archiver_summary
  • gp_stat_bgwriter_summary
  • gp_stat_database_summary
  • gp_stat_slru_summary
  • gp_stat_progress_analyze_summary
  • gp_stat_progress_basebackup_summary
  • gp_stat_progress_cluster_summary
  • gp_stat_progress_copy_summary
  • gp_stat_progress_create_index_summary
  • gp_stat_progress_vacuum_summary
  • gp_stat_sys_indexes_summary
  • gp_stat_user_functions_summary
  • gp_stat_user_indexes_summary
  • gp_stat_wal_summary
  • gp_stat_xact_all_tables_summary
  • gp_stat_xact_sys_tables_summary
  • gp_stat_xact_user_functions_summary
  • gp_stat_xact_user_tables_summary
  • gp_statio_all_indexes_summary
  • gp_statio_all_sequences_summary
  • gp_statio_all_tables_summary
  • gp_statio_sys_indexes_summary
  • gp_statio_sys_sequences_summary
  • gp_statio_sys_tables_summary
  • gp_statio_user_indexes_summary
  • gp_statio_user_sequences_summary
  • gp_statio_user_tables_summary

Parent topic: System Catalogs

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