Overview
Overview
Table 12.1 lists the system catalogs. More detailed documentation of each catalog follows below.
Most system catalogs are copied from the template database during database creation and are thereafter database-specific. A few catalogs are physically shared across all databases in a cluster; these are noted in the descriptions of the individual catalogs.
Table System Catalogs
| Catalog Name | Purpose |
|---|---|
| pg_aggregate | aggregate functions |
| pg_attrdef | column default values |
| pg_attribute | table columns (“attributes”) |
| pg_authid | authorization identifiers (roles) |
| pg_auth_members | authorization identifier membership relationships |
| pg_cast | casts (data type conversions) |
| pg_class | tables, indexes, sequences, views (“relations”) |
| pg_collation | collations (locale information) |
| pg_constraint | check constraints, unique constraints, primary key constraints, foreign key constraints |
| pg_conversion | encoding conversion information |
| pg_database | databases within this database cluster |
| pg_db_role_setting | per-role and per-database settings |
| pg_default_acl | default privileges for object types |
| pg_depend | dependencies between database objects |
| pg_description | descriptions or comments on database objects |
| pg_enum | enum label and value definitions |
| pg_event_trigger | event triggers |
| pg_extension | installed extensions |
| pg_foreign_data_wrapper | foreign-data wrapper definitions |
| pg_foreign_server | foreign server definitions |
| pg_foreign_table | additional foreign table information |
| pg_index | additional index information |
| pg_inherits | table inheritance hierarchy |
| pg_language | languages for writing functions |
| pg_namespace | schemas |
| pg_operator | operators |
| pg_policy | row-security policies |
| pg_proc | functions and procedures |
| pg_range | information about range types |
| pg_rewrite | query rewrite rules |
| pg_seclabel | security labels on database objects |
| pg_sequence | information about sequences |
| pg_shdepend | dependencies on shared objects |
| pg_shdescription | comments on shared objects |
| pg_shseclabel | security labels on shared database objects |
| pg_tablespace | tablespaces within this database cluster |
| pg_type | data types |