52.1. Overview
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## 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 | 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_parameter_acl | configuration parameters for which privileges have been granted
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_namespace | schema to publication mapping
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

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