# 52.22. pg_extension

The catalog pg_extension stores information about the installed extensions. See Section 38.17 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.