51.1. Overview

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 NamePurpose
pg_aggregateaggregate functions
pg_amrelation access methods
pg_amopaccess method operators
pg_amprocaccess method support functions
pg_attrdefcolumn default values
pg_attributetable columns (attributes)
pg_authidauthorization identifiers (roles)
pg_auth_membersauthorization identifier membership relationships
pg_castcasts (data type conversions)
pg_classtables, indexes, sequences, views (relations)
pg_collationcollations (locale information)
pg_constraintcheck constraints, unique constraints, primary key constraints, foreign key constraints
pg_conversionencoding conversion information
pg_databasedatabases within this database cluster
pg_db_role_settingper-role and per-database settings
pg_default_acldefault privileges for object types
pg_dependdependencies between database objects
pg_descriptiondescriptions or comments on database objects
pg_enumenum label and value definitions
pg_event_triggerevent triggers
pg_extensioninstalled extensions
pg_foreign_data_wrapperforeign-data wrapper definitions
pg_foreign_serverforeign server definitions
pg_foreign_tableadditional foreign table information
pg_indexadditional index information
pg_inheritstable inheritance hierarchy
pg_init_privsobject initial privileges
pg_languagelanguages for writing functions
pg_largeobjectdata pages for large objects
pg_largeobject_metadatametadata for large objects
pg_opclassaccess method operator classes
pg_opfamilyaccess method operator families
pg_partitioned_tableinformation about partition key of tables
pg_pltemplatetemplate data for procedural languages
pg_policyrow-security policies
pg_procfunctions and procedures
pg_publicationpublications for logical replication
pg_publication_relrelation to publication mapping
pg_rangeinformation about range types
pg_replication_originregistered replication origins
pg_rewritequery rewrite rules
pg_seclabelsecurity labels on database objects
pg_sequenceinformation about sequences
pg_shdependdependencies on shared objects
pg_shdescriptioncomments on shared objects
pg_shseclabelsecurity labels on shared database objects
pg_statisticplanner statistics
pg_statistic_extextended planner statistics (definition)
pg_statistic_ext_dataextended planner statistics (built statistics)
pg_subscriptionlogical replication subscriptions
pg_subscription_relrelation state for subscriptions
pg_tablespacetablespaces within this database cluster
pg_transformtransforms (data type to procedural language conversions)
pg_ts_configtext search configurations
pg_ts_config_maptext search configurations' token mappings
pg_ts_dicttext search dictionaries
pg_ts_parsertext search parsers
pg_ts_templatetext search templates
pg_typedata types
pg_user_mappingmappings of users to foreign servers