PostgreSQL 8.2.20 Documentation
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# 43.1. Overview

Table 43-1 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 43-1. System Catalogs

Catalog Name | Purpose
--- | ---
`pg_aggregate` | aggregate functions
`pg_am` | index access methods
`pg_amop` | access method operators
`pg_amproc` | access method support procedures
`pg_attrdef` | column default values
`pg_attribute` | table columns ("attributes")
`pg_authid` | authorization identifiers (roles)
`pg_auth_members` | authorization identifier membership relationships
`pg_autovacuum` | per-relation autovacuum configuration parameters
`pg_cast` | casts (data type conversions)
`pg_class` | tables, indexes, sequences, views ("relations")
`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_depend` | dependencies between database objects
`pg_description` | descriptions or comments on database objects
`pg_index` | additional index information
`pg_inherits` | table inheritance hierarchy
`pg_language` | languages for writing functions
`pg_largeobject` | large objects
`pg_listener` | asynchronous notification support
`pg_namespace` | schemas
`pg_opclass` | index access method operator classes
`pg_operator` | operators
`pg_pltemplate` | template data for procedural languages
`pg_proc` | functions and procedures
`pg_rewrite` | query rewrite rules
`pg_shdepend` | dependencies on shared objects
`pg_shdescription` | comments on shared objects
`pg_statistic` | planner statistics
`pg_tablespace` | tablespaces within this database cluster
`pg_trigger` | triggers
`pg_type` | data types

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