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.

In Greenplum Database 6, the pg_stat_*_indexes views display access statistics for indexes only from the master instance. Access statistics from segment instances are ignored. You can create views that display usage statistics that combine statistics from the master and the segment instances, see Index Access Statistics from the Master and Segment Instances.

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

Index Access Statistics from the Master and Segment Instances

To display index access statistics that combine statistics from the master and the segment instances you can create these views. A user requires SELECT privilege on the views to use them.

-- Create these index access statistics views
--   pg_stat_all_indexes_gpdb6
--   pg_stat_sys_indexes_gpdb6
--   pg_stat_user_indexes_gpdb6

CREATE VIEW pg_stat_all_indexes_gpdb6 AS
SELECT
    s.relid,
    s.indexrelid,
    s.schemaname,
    s.relname,
    s.indexrelname,
    m.idx_scan,
    m.idx_tup_read,
    m.idx_tup_fetch
FROM
    (SELECT
         relid,
         indexrelid,
         schemaname,
         relname,
         indexrelname,
         sum(idx_scan) as idx_scan,
         sum(idx_tup_read) as idx_tup_read,
         sum(idx_tup_fetch) as idx_tup_fetch
     FROM gp_dist_random('pg_stat_all_indexes')
     WHERE relid >= 16384
     GROUP BY relid, indexrelid, schemaname, relname, indexrelname
     UNION ALL
     SELECT *
     FROM pg_stat_all_indexes
     WHERE relid < 16384) m, pg_stat_all_indexes s
WHERE m.relid = s.relid AND m.indexrelid = s.indexrelid;


CREATE VIEW pg_stat_sys_indexes_gpdb6 AS 
    SELECT * FROM pg_stat_all_indexes_gpdb6
    WHERE schemaname IN ('pg_catalog', 'information_schema') OR
          schemaname ~ '^pg_toast';


CREATE VIEW pg_stat_user_indexes_gpdb6 AS 
    SELECT * FROM pg_stat_all_indexes_gpdb6
    WHERE schemaname NOT IN ('pg_catalog', 'information_schema') AND
          schemaname !~ '^pg_toast';

Parent topic: System Catalogs Definitions