51.1. Overview
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## 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 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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