Table 49-1 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 49-1. System Catalogs

Catalog Name Purpose
pg_aggregate aggregate functions
pg_am index access methods
pg_amop access method operators
pg_amproc access method support procedures
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_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_pltemplate template data for procedural languages
pg_policy row-security policies
pg_proc functions and procedures
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_shdepend dependencies on shared objects
pg_shdescription comments on shared objects
pg_shseclabel security labels on shared database objects
pg_statistic planner statistics
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