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_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 (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 |