pg_statistic_ext
The catalog pg_statistic_ext
holds definitions of extended planner statistics. Each row in this catalog corresponds to a statistics object created with CREATE STATISTICS.
Table 51.51. pg_statistic_ext
Columns
Name | Type | References | Description |
---|---|---|---|
stxrelid |
oid |
|
Table containing the columns described by this object |
stxname |
name |
Name of the statistics object | |
stxnamespace |
oid |
|
The OID of the namespace that contains this statistics object |
stxowner |
oid |
|
Owner of the statistics object |
stxkeys |
int2vector |
|
An array of attribute numbers, indicating which table columns are covered by this statistics object; for example a value of 1 3 would mean that the first and the third table columns are covered |
stxkind |
char[] |
An array containing codes for the enabled statistics kinds; valid values are: d for n-distinct statistics, f for functional dependency statistics, and m for most common values (MCV) list statistics |
The pg_statistic_ext
entry is filled in completely during CREATE STATISTICS
, but the actual statistical values are not computed then. Subsequent ANALYZE
commands compute the desired values and populate an entry in the pg_statistic_ext_data
catalog.
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