PostgreSQL

51.51. `pg_statistic_ext`
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51.51. `pg_statistic_ext`

The catalog pg_statistic_ext holds 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

Name	Type	References	Description
`stxrelid`	`oid`	`pg_class.oid`	Table containing the columns described by this object
`stxname`	`name`		Name of the statistics object
`stxnamespace`	`oid`	`pg_namespace.oid`	The OID of the namespace that contains this statistics object
`stxowner`	`oid`	`pg_authid.oid`	Owner of the statistics object
`stxkeys`	`int2vector`	`pg_attribute.attnum`	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
`stxndistinct`	`pg_ndistinct`		N-distinct counts, serialized as `pg_ndistinct` type
`stxdependencies`	`pg_dependencies`		Functional dependency statistics, serialized as `pg_dependencies` type

stxrelid

oid

pg_class.oid

Table containing the columns described by this object

stxname

name

Name of the statistics object

stxnamespace

oid

pg_namespace.oid

The OID of the namespace that contains this statistics object

stxowner

oid

pg_authid.oid

Owner of the statistics object

stxkeys

int2vector

pg_attribute.attnum

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

stxndistinct

pg_ndistinct

N-distinct counts, serialized as pg_ndistinct type

stxdependencies

pg_dependencies

Functional dependency statistics, serialized as pg_dependencies type

The stxkind field is filled at creation of the statistics object, indicating which statistic type(s) are desired. The fields after it are initially NULL and are filled only when the corresponding statistic has been computed by ANALYZE.

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51.50. pg_statistic

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51.51. pg_statistic_ext

51.51. `pg_statistic_ext`