PostgreSQL

52.64. System Views
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52.64. System Views

In addition to the system catalogs, PostgreSQL provides a number of built-in views. Some system views provide convenient access to some commonly used queries on the system catalogs. Other views provide access to internal server state.

The information schema (Chapter 37) provides an alternative set of views which overlap the functionality of the system views. Since the information schema is SQL-standard whereas the views described here are PostgreSQL-specific, it’s usually better to use the information schema if it provides all the information you need.

Table 52.65 lists the system views described here. More detailed documentation of each view follows below. There are some additional views that provide access to the results of the statistics collector; they are described in Table 28.2.

Except where noted, all the views described here are read-only.

Table 52.65. System Views

View Name Purpose

View Name	Purpose
`pg_available_extensions`	available extensions
`pg_available_extension_versions`	available versions of extensions
`pg_backend_memory_contexts`	backend memory contexts
`pg_config`	compile-time configuration parameters
`pg_cursors`	open cursors
`pg_file_settings`	summary of configuration file contents
`pg_group`	groups of database users
`pg_hba_file_rules`	summary of client authentication configuration file contents
`pg_indexes`	indexes
`pg_locks`	locks currently held or awaited
`pg_matviews`	materialized views
`pg_policies`	policies
`pg_prepared_statements`	prepared statements
`pg_prepared_xacts`	prepared transactions
`pg_publication_tables`	publications and their associated tables
`pg_replication_origin_status`	information about replication origins, including replication progress
`pg_replication_slots`	replication slot information
`pg_roles`	database roles
`pg_rules`	rules
`pg_seclabels`	security labels
`pg_sequences`	sequences
`pg_settings`	parameter settings
`pg_shadow`	database users
`pg_shmem_allocations`	shared memory allocations
`pg_stats`	planner statistics
`pg_stats_ext`	extended planner statistics
`pg_stats_ext_exprs`	extended planner statistics for expressions
`pg_tables`	tables
`pg_timezone_abbrevs`	time zone abbreviations
`pg_timezone_names`	time zone names
`pg_user`	database users
`pg_user_mappings`	user mappings
`pg_views`	views

pg_available_extensions

available extensions

pg_available_extension_versions

available versions of extensions

pg_backend_memory_contexts

backend memory contexts

pg_config

compile-time configuration parameters

pg_cursors

open cursors

pg_file_settings

summary of configuration file contents

pg_group

groups of database users

pg_hba_file_rules

summary of client authentication configuration file contents

pg_indexes

indexes

pg_locks

locks currently held or awaited

pg_matviews

materialized views

pg_policies

policies

pg_prepared_statements

prepared statements

pg_prepared_xacts

prepared transactions

pg_publication_tables

publications and their associated tables

pg_replication_origin_status

information about replication origins, including replication progress

pg_replication_slots

replication slot information

database roles

rules

security labels

sequences

parameter settings

database users

pg_shmem_allocations

shared memory allocations

pg_stats

planner statistics

pg_stats_ext

extended planner statistics

pg_stats_ext_exprs

extended planner statistics for expressions

pg_tables

tables

pg_timezone_abbrevs

time zone abbreviations

time zone names

database users

user mappings

views

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