pg_statistic_ext_data
The pg_statistic_ext_data system catalog table holds data for extended planner statistics defined in pg_statistic_ext. Each row in this catalog corresponds to a statistics object created with CREATE STATISTICS.
Like pg_statistic, pg_statistic_ext_data should not be readable by the public, since the contents might be considered sensitive. (Example: most common combinations of values in columns might be quite interesting.) pg_stats_ext is a publicly readable view on pg_statistic_ext_data (after joining with pg_statistic_ext) that only exposes information about those tables and columns that are readable by the current user.
| column | type | references | description |
|---|---|---|---|
stxoid |
oid | pg_statistic_ext.oid | The extended statistic object containing the definition for this data. |
stxdndistinct |
pg_ndistinct | N-distinct counts, serialized as pg_ndistinct type. |
|
stxddependencies |
pg_dependencies | Functional dependency statistics, serialized as pg_dependencies type. |
|
stxdmcv |
pg_mcv_list | MCV (most-common values) list statistics, serialized as pg_mcv_list type. |
Parent topic: System Catalogs Definitions