Table 51.1 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 51.1. System Catalogs
| Catalog Name | Purpose |
|---|---|
pg_aggregate | aggregate functions |
pg_am | relation access methods |
pg_amop | access method operators |
pg_amproc | access method support 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_init_privs | object initial privileges |
pg_language | languages for writing functions |
pg_largeobject | data pages for large objects |
pg_largeobject_metadata | metadata for large objects |
pg_namespace | schemas |
pg_opclass | access method operator classes |
pg_operator | operators |
pg_opfamily | access method operator families |
pg_partitioned_table | information about partition key of tables |
pg_policy | row-security policies |
pg_proc | functions and procedures |
pg_publication | publications for logical replication |
pg_publication_rel | relation to publication mapping |
pg_range | information about range types |
pg_replication_origin | registered replication origins |
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_statistic | planner statistics |
pg_statistic_ext | extended planner statistics (definition) |
pg_statistic_ext_data | extended planner statistics (built statistics) |
pg_subscription | logical replication subscriptions |
pg_subscription_rel | relation state for subscriptions |
pg_tablespace | tablespaces within this database cluster |
pg_transform | transforms (data type to procedural language conversions) |
pg_trigger | triggers |
pg_ts_config | text search configurations |
pg_ts_config_map | text search configurations' token mappings |
pg_ts_dict | text search dictionaries |
pg_ts_parser | text search parsers |
pg_ts_template | text search templates |
pg_type | data types |
pg_user_mapping | mappings of users to foreign servers |