Automatic Statistics Collection Parameters

When automatic statistics collection is enabled, you can run ANALYZE automatically in the same transaction as an INSERT, UPDATE, DELETE, COPY or CREATE TABLE...AS SELECT statement when a certain threshold of rows is affected (on_change), or when a newly generated table has no statistics (on_no_stats). To enable this feature, set the following server configuration parameters in your Greenplum master postgresql.conf file and restart Greenplum Database:

• gp_autostats_mode
• gp_autostats_mode_in_functions
• log_autostats
• gp_autostats_on_change_threshold

Warning: Depending on the specific nature of your database operations, automatic statistics collection can have a negative performance impact. Carefully evaluate whether the default setting of on_no_stats is appropriate for your system.

Parent topic: Configuration Parameter Categories