## 52.22. `pg_extension`

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 The catalog `pg_extension` stores information about the installed extensions. See [Section 38.17](extend-extensions.html) for details about extensions.

**Table 52.22. `pg_extension` Columns**

|                                                                     Column Type<br/><br/> Description                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                                                                   `oid` `oid`<br/><br/> Row identifier                                                                    |
|                                                             `extname` `name`<br/><br/> Name of the extension                                                              |
|                                `extowner` `oid` (references [`pg_authid`](catalog-pg-authid.html).`oid`)<br/><br/> Owner of the extension                                 |
|             `extnamespace` `oid` (references [`pg_namespace`](catalog-pg-namespace.html).`oid`)<br/><br/> Schema containing the extension's exported objects              |
|                                          `extrelocatable` `bool`<br/><br/> True if extension can be relocated to another schema                                           |
|                                                       `extversion` `text`<br/><br/> Version name for the extension                                                        |
|`extconfig` `oid[]` (references [`pg_class`](catalog-pg-class.html).`oid`)<br/><br/> Array of `regclass` OIDs for the extension's configuration table(s), or `NULL` if none|
|                 `extcondition` `text[]`<br/><br/> 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.

