System Views
PostgreSQL 9.5.25 Documentation | |||
---|---|---|---|
Prev | Up | Chapter 49. System Catalogs | Next |
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 34 ) 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 49-57 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 27-2 .
Except where noted, all the views described here are read-only.
Table 49-57. System Views
View Name | Purpose |
---|---|
pg_available_extensions | available extensions |
pg_available_extension_versions | available versions of extensions |
pg_cursors | open cursors |
pg_file_settings | summary of configuration file contents |
pg_group | groups of database users |
pg_indexes | indexes |
pg_locks | currently held locks |
pg_matviews | materialized views |
pg_policies | policies |
pg_prepared_statements | prepared statements |
pg_prepared_xacts | prepared transactions |
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_settings | parameter settings |
pg_shadow | database users |
pg_stats | planner statistics |
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 |