Documentazione di PostgreSQL 9.0 > Internal > System Catalogs > System Views
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45.46. 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 (Capitolo 34, The Information Schema) 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.

Tabella 45.47, «System Views» 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 Tabella 27.1, «Standard Statistics Views».

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

Tabella 45.47. System Views

View NamePurpose
pg_cursorsopen cursors
pg_groupgroups of database users
pg_indexesindexes
pg_lockscurrently held locks
pg_prepared_statementsprepared statements
pg_prepared_xactsprepared transactions
pg_rolesdatabase roles
pg_rulesrules
pg_settingsparameter settings
pg_shadowdatabase users
pg_statsplanner statistics
pg_tablestables
pg_timezone_abbrevstime zone abbreviations
pg_timezone_namestime zone names
pg_userdatabase users
pg_viewsviews

Documentazione di PostgreSQL 9.0 > Internal > System Catalogs > System Views
Precedentepg_user_mappingpg_cursorsSuccessivo