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 35) 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 50-58 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 50-58. System Views
|pg_available_extension_versions||available versions of extensions|
|pg_config||compile-time configuration parameters|
|pg_file_settings||summary of configuration file contents|
|pg_group||groups of database users|
|pg_locks||locks currently held or awaited|
|pg_replication_origin_status||information about replication origins, including replication progress|
|pg_replication_slots||replication slot information|
|pg_timezone_abbrevs||time zone abbreviations|
|pg_timezone_names||time zone names|