51.22. pg_extension

51.22. `pg_extension`
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The catalog pg_extension stores information about the installed extensions. See Section 37.17 for details about extensions.

Table 51.22. pg_extension Columns

Column Type Description
`oid` `oid` Row identifier
`extname` `name` Name of the extension
`extowner` `oid` (references `pg_authid` . `oid` ) Owner of the extension
`extnamespace` `oid` (references `pg_namespace` . `oid` ) Schema containing the extension's exported objects
`extrelocatable` `bool` True if extension can be relocated to another schema
`extversion` `text` Version name for the extension
`extconfig` `oid[]` (references `pg_class` . `oid` ) Array of `regclass` OIDs for the extension's configuration table(s), or `NULL` if none
`extcondition` `text[]` Array of `WHERE` -clause filter conditions for the extension's configuration table(s), or `NULL` if none

Column Type

Description

oid oid

Row identifier

extname name

Name of the extension

extowner oid (references pg_authid . oid )

Owner of the extension

extnamespace oid (references pg_namespace . oid )

Schema containing the extension's exported objects

extrelocatable bool

True if extension can be relocated to another schema

extversion text

Version name for the extension

extconfig oid[] (references pg_class . oid )

Array of regclass OIDs for the extension's configuration table(s), or NULL if none

extcondition text[]

Array of WHERE -clause filter conditions for the extension's configuration table(s), or NULL if none

Note that unlike most catalogs with a " namespace " column, extnamespace is not meant to imply that the extension belongs to that schema. Extension names are never schema-qualified. Rather, extnamespace indicates the schema that contains most or all of the extension's objects. If extrelocatable is true, then this schema must in fact contain all schema-qualifiable objects belonging to the extension.

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