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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter 54. System Views</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="catalog-pg-user-mapping.html" title="53.65. pg_user_mapping" /><link rel="next" href="views-overview.html" title="54.1. Overview" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">Chapter 54. System Views</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="catalog-pg-user-mapping.html" title="53.65. pg_user_mapping">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="internals.html" title="Part VII. Internals">Up</a></td><th width="60%" align="center">Part VII. Internals</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="views-overview.html" title="54.1. Overview">Next</a></td></tr></table><hr /></div><div class="chapter" id="VIEWS"><div class="titlepage"><div><div><h2 class="title">Chapter 54. System Views</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="views-overview.html">54.1. Overview</a></span></dt><dt><span class="sect1"><a href="view-pg-available-extensions.html">54.2. <code class="structname">pg_available_extensions</code></a></span></dt><dt><span class="sect1"><a href="view-pg-available-extension-versions.html">54.3. <code class="structname">pg_available_extension_versions</code></a></span></dt><dt><span class="sect1"><a href="view-pg-backend-memory-contexts.html">54.4. <code class="structname">pg_backend_memory_contexts</code></a></span></dt><dt><span class="sect1"><a href="view-pg-config.html">54.5. <code class="structname">pg_config</code></a></span></dt><dt><span class="sect1"><a href="view-pg-cursors.html">54.6. <code class="structname">pg_cursors</code></a></span></dt><dt><span class="sect1"><a href="view-pg-file-settings.html">54.7. <code class="structname">pg_file_settings</code></a></span></dt><dt><span class="sect1"><a href="view-pg-group.html">54.8. <code class="structname">pg_group</code></a></span></dt><dt><span class="sect1"><a href="view-pg-hba-file-rules.html">54.9. <code class="structname">pg_hba_file_rules</code></a></span></dt><dt><span class="sect1"><a href="view-pg-ident-file-mappings.html">54.10. <code class="structname">pg_ident_file_mappings</code></a></span></dt><dt><span class="sect1"><a href="view-pg-indexes.html">54.11. <code class="structname">pg_indexes</code></a></span></dt><dt><span class="sect1"><a href="view-pg-locks.html">54.12. <code class="structname">pg_locks</code></a></span></dt><dt><span class="sect1"><a href="view-pg-matviews.html">54.13. <code class="structname">pg_matviews</code></a></span></dt><dt><span class="sect1"><a href="view-pg-policies.html">54.14. <code class="structname">pg_policies</code></a></span></dt><dt><span class="sect1"><a href="view-pg-prepared-statements.html">54.15. <code class="structname">pg_prepared_statements</code></a></span></dt><dt><span class="sect1"><a href="view-pg-prepared-xacts.html">54.16. <code class="structname">pg_prepared_xacts</code></a></span></dt><dt><span class="sect1"><a href="view-pg-publication-tables.html">54.17. <code class="structname">pg_publication_tables</code></a></span></dt><dt><span class="sect1"><a href="view-pg-replication-origin-status.html">54.18. <code class="structname">pg_replication_origin_status</code></a></span></dt><dt><span class="sect1"><a href="view-pg-replication-slots.html">54.19. <code class="structname">pg_replication_slots</code></a></span></dt><dt><span class="sect1"><a href="view-pg-roles.html">54.20. <code class="structname">pg_roles</code></a></span></dt><dt><span class="sect1"><a href="view-pg-rules.html">54.21. <code class="structname">pg_rules</code></a></span></dt><dt><span class="sect1"><a href="view-pg-seclabels.html">54.22. <code class="structname">pg_seclabels</code></a></span></dt><dt><span class="sect1"><a href="view-pg-sequences.html">54.23. <code class="structname">pg_sequences</code></a></span></dt><dt><span class="sect1"><a href="view-pg-settings.html">54.24. <code class="structname">pg_settings</code></a></span></dt><dt><span class="sect1"><a href="view-pg-shadow.html">54.25. <code class="structname">pg_shadow</code></a></span></dt><dt><span class="sect1"><a href="view-pg-shmem-allocations.html">54.26. <code class="structname">pg_shmem_allocations</code></a></span></dt><dt><span class="sect1"><a href="view-pg-stats.html">54.27. <code class="structname">pg_stats</code></a></span></dt><dt><span class="sect1"><a href="view-pg-stats-ext.html">54.28. <code class="structname">pg_stats_ext</code></a></span></dt><dt><span class="sect1"><a href="view-pg-stats-ext-exprs.html">54.29. <code class="structname">pg_stats_ext_exprs</code></a></span></dt><dt><span class="sect1"><a href="view-pg-tables.html">54.30. <code class="structname">pg_tables</code></a></span></dt><dt><span class="sect1"><a href="view-pg-timezone-abbrevs.html">54.31. <code class="structname">pg_timezone_abbrevs</code></a></span></dt><dt><span class="sect1"><a href="view-pg-timezone-names.html">54.32. <code class="structname">pg_timezone_names</code></a></span></dt><dt><span class="sect1"><a href="view-pg-user.html">54.33. <code class="structname">pg_user</code></a></span></dt><dt><span class="sect1"><a href="view-pg-user-mappings.html">54.34. <code class="structname">pg_user_mappings</code></a></span></dt><dt><span class="sect1"><a href="view-pg-views.html">54.35. <code class="structname">pg_views</code></a></span></dt></dl></div><p>
+ In addition to the system catalogs, <span class="productname">PostgreSQL</span>
+ 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.
+ </p><p>
+ The information schema (<a class="xref" href="information-schema.html" title="Chapter 37. The Information Schema">Chapter 37</a>) 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 <span class="productname">PostgreSQL</span>-specific,
+ it's usually better to use the information schema if it provides all
+ the information you need.
+ </p><p>
+ <a class="xref" href="views-overview.html#VIEW-TABLE" title="Table 54.1. System Views">Table 54.1</a> lists the system views described here.
+ More detailed documentation of each view follows below.
+ There are some additional views that provide access to accumulated
+ statistics; they are described in
+ <a class="xref" href="monitoring-stats.html#MONITORING-STATS-VIEWS-TABLE" title="Table 28.2. Collected Statistics Views">Table 28.2</a>.
+ </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="catalog-pg-user-mapping.html" title="53.65. pg_user_mapping">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="internals.html" title="Part VII. Internals">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="views-overview.html" title="54.1. Overview">Next</a></td></tr><tr><td width="40%" align="left" valign="top">53.65. <code class="structname">pg_user_mapping</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 54.1. Overview</td></tr></table></div></body></html> \ No newline at end of file