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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 53. System Catalogs</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="executor.html" title="52.6. Executor" /><link rel="next" href="catalogs-overview.html" title="53.1. 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 53. System Catalogs</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="executor.html" title="52.6. Executor">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 16.3 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="catalogs-overview.html" title="53.1. Overview">Next</a></td></tr></table><hr /></div><div class="chapter" id="CATALOGS"><div class="titlepage"><div><div><h2 class="title">Chapter 53. System Catalogs</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="catalogs-overview.html">53.1. Overview</a></span></dt><dt><span class="sect1"><a href="catalog-pg-aggregate.html">53.2. <code class="structname">pg_aggregate</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-am.html">53.3. <code class="structname">pg_am</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-amop.html">53.4. <code class="structname">pg_amop</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-amproc.html">53.5. <code class="structname">pg_amproc</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-attrdef.html">53.6. <code class="structname">pg_attrdef</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-attribute.html">53.7. <code class="structname">pg_attribute</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-authid.html">53.8. <code class="structname">pg_authid</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-auth-members.html">53.9. <code class="structname">pg_auth_members</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-cast.html">53.10. <code class="structname">pg_cast</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-class.html">53.11. <code class="structname">pg_class</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-collation.html">53.12. <code class="structname">pg_collation</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-constraint.html">53.13. <code class="structname">pg_constraint</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-conversion.html">53.14. <code class="structname">pg_conversion</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-database.html">53.15. <code class="structname">pg_database</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-db-role-setting.html">53.16. <code class="structname">pg_db_role_setting</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-default-acl.html">53.17. <code class="structname">pg_default_acl</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-depend.html">53.18. <code class="structname">pg_depend</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-description.html">53.19. <code class="structname">pg_description</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-enum.html">53.20. <code class="structname">pg_enum</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-event-trigger.html">53.21. <code class="structname">pg_event_trigger</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-extension.html">53.22. <code class="structname">pg_extension</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-foreign-data-wrapper.html">53.23. <code class="structname">pg_foreign_data_wrapper</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-foreign-server.html">53.24. <code class="structname">pg_foreign_server</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-foreign-table.html">53.25. <code class="structname">pg_foreign_table</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-index.html">53.26. <code class="structname">pg_index</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-inherits.html">53.27. <code class="structname">pg_inherits</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-init-privs.html">53.28. <code class="structname">pg_init_privs</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-language.html">53.29. <code class="structname">pg_language</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-largeobject.html">53.30. <code class="structname">pg_largeobject</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-largeobject-metadata.html">53.31. <code class="structname">pg_largeobject_metadata</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-namespace.html">53.32. <code class="structname">pg_namespace</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-opclass.html">53.33. <code class="structname">pg_opclass</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-operator.html">53.34. <code class="structname">pg_operator</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-opfamily.html">53.35. <code class="structname">pg_opfamily</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-parameter-acl.html">53.36. <code class="structname">pg_parameter_acl</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-partitioned-table.html">53.37. <code class="structname">pg_partitioned_table</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-policy.html">53.38. <code class="structname">pg_policy</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-proc.html">53.39. <code class="structname">pg_proc</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-publication.html">53.40. <code class="structname">pg_publication</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-publication-namespace.html">53.41. <code class="structname">pg_publication_namespace</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-publication-rel.html">53.42. <code class="structname">pg_publication_rel</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-range.html">53.43. <code class="structname">pg_range</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-replication-origin.html">53.44. <code class="structname">pg_replication_origin</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-rewrite.html">53.45. <code class="structname">pg_rewrite</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-seclabel.html">53.46. <code class="structname">pg_seclabel</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-sequence.html">53.47. <code class="structname">pg_sequence</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-shdepend.html">53.48. <code class="structname">pg_shdepend</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-shdescription.html">53.49. <code class="structname">pg_shdescription</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-shseclabel.html">53.50. <code class="structname">pg_shseclabel</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-statistic.html">53.51. <code class="structname">pg_statistic</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-statistic-ext.html">53.52. <code class="structname">pg_statistic_ext</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-statistic-ext-data.html">53.53. <code class="structname">pg_statistic_ext_data</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-subscription.html">53.54. <code class="structname">pg_subscription</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-subscription-rel.html">53.55. <code class="structname">pg_subscription_rel</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-tablespace.html">53.56. <code class="structname">pg_tablespace</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-transform.html">53.57. <code class="structname">pg_transform</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-trigger.html">53.58. <code class="structname">pg_trigger</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-config.html">53.59. <code class="structname">pg_ts_config</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-config-map.html">53.60. <code class="structname">pg_ts_config_map</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-dict.html">53.61. <code class="structname">pg_ts_dict</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-parser.html">53.62. <code class="structname">pg_ts_parser</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-template.html">53.63. <code class="structname">pg_ts_template</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-type.html">53.64. <code class="structname">pg_type</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-user-mapping.html">53.65. <code class="structname">pg_user_mapping</code></a></span></dt></dl></div><p>
   The system catalogs are the place where a relational database
   management system stores schema metadata, such as information about
   tables and columns, and internal bookkeeping information.
   <span class="productname">PostgreSQL</span>'s system catalogs are regular
   tables.  You can drop and recreate the tables, add columns, insert
   and update values, and severely mess up your system that way.
   Normally, one should not change the system catalogs by hand, there
   are normally SQL commands to do that.  (For example, <code class="command">CREATE
   DATABASE</code> inserts a row into the
   <code class="structname">pg_database</code> catalog — and actually
   creates the database on disk.)  There are some exceptions for
   particularly esoteric operations, but many of those have been made
   available as SQL commands over time, and so the need for direct manipulation
   of the system catalogs is ever decreasing.
  </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="executor.html" title="52.6. Executor">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="catalogs-overview.html" title="53.1. Overview">Next</a></td></tr><tr><td width="40%" align="left" valign="top">52.6. Executor </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 16.3 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 53.1. Overview</td></tr></table></div></body></html>