52.22. pg_extension
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## 52.22. pg_extension #

The catalog pg_extension stores information about the installed extensions. See Section 36.17 for details about extensions.

Table 52.22. 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

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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