52.1. Overview

Table 52.1 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 52.1. System Catalogs

Catalog Name Purpose
pg_aggregate aggregate functions
pg_am index access methods
pg_amop access method operators
pg_amproc access method support 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_pltemplate template data for procedural languages
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
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
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