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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 51. 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 V1.79.1" /><link rel="prev" href="executor.html" title="50.6. Executor" /><link rel="next" href="catalogs-overview.html" title="51.1. Overview" /></head><body id="docContent" class="container-fluid col-10"><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">Chapter 51. System Catalogs</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="executor.html" title="50.6. 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 13.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="catalogs-overview.html" title="51.1. Overview">Next</a></td></tr></table><hr></hr></div><div class="chapter" id="CATALOGS"><div class="titlepage"><div><div><h2 class="title">Chapter 51. 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">51.1. Overview</a></span></dt><dt><span class="sect1"><a href="catalog-pg-aggregate.html">51.2. <code class="structname">pg_aggregate</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-am.html">51.3. <code class="structname">pg_am</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-amop.html">51.4. <code class="structname">pg_amop</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-amproc.html">51.5. <code class="structname">pg_amproc</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-attrdef.html">51.6. <code class="structname">pg_attrdef</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-attribute.html">51.7. <code class="structname">pg_attribute</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-authid.html">51.8. <code class="structname">pg_authid</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-auth-members.html">51.9. <code class="structname">pg_auth_members</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-cast.html">51.10. <code class="structname">pg_cast</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-class.html">51.11. <code class="structname">pg_class</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-collation.html">51.12. <code class="structname">pg_collation</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-constraint.html">51.13. <code class="structname">pg_constraint</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-conversion.html">51.14. <code class="structname">pg_conversion</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-database.html">51.15. <code class="structname">pg_database</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-db-role-setting.html">51.16. <code class="structname">pg_db_role_setting</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-default-acl.html">51.17. <code class="structname">pg_default_acl</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-depend.html">51.18. <code class="structname">pg_depend</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-description.html">51.19. <code class="structname">pg_description</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-enum.html">51.20. <code class="structname">pg_enum</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-event-trigger.html">51.21. <code class="structname">pg_event_trigger</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-extension.html">51.22. <code class="structname">pg_extension</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-foreign-data-wrapper.html">51.23. <code class="structname">pg_foreign_data_wrapper</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-foreign-server.html">51.24. <code class="structname">pg_foreign_server</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-foreign-table.html">51.25. <code class="structname">pg_foreign_table</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-index.html">51.26. <code class="structname">pg_index</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-inherits.html">51.27. <code class="structname">pg_inherits</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-init-privs.html">51.28. <code class="structname">pg_init_privs</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-language.html">51.29. <code class="structname">pg_language</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-largeobject.html">51.30. <code class="structname">pg_largeobject</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-largeobject-metadata.html">51.31. <code class="structname">pg_largeobject_metadata</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-namespace.html">51.32. <code class="structname">pg_namespace</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-opclass.html">51.33. <code class="structname">pg_opclass</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-operator.html">51.34. <code class="structname">pg_operator</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-opfamily.html">51.35. <code class="structname">pg_opfamily</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-partitioned-table.html">51.36. <code class="structname">pg_partitioned_table</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-policy.html">51.37. <code class="structname">pg_policy</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-proc.html">51.38. <code class="structname">pg_proc</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-publication.html">51.39. <code class="structname">pg_publication</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-publication-rel.html">51.40. <code class="structname">pg_publication_rel</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-range.html">51.41. <code class="structname">pg_range</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-replication-origin.html">51.42. <code class="structname">pg_replication_origin</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-rewrite.html">51.43. <code class="structname">pg_rewrite</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-seclabel.html">51.44. <code class="structname">pg_seclabel</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-sequence.html">51.45. <code class="structname">pg_sequence</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-shdepend.html">51.46. <code class="structname">pg_shdepend</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-shdescription.html">51.47. <code class="structname">pg_shdescription</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-shseclabel.html">51.48. <code class="structname">pg_shseclabel</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-statistic.html">51.49. <code class="structname">pg_statistic</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-statistic-ext.html">51.50. <code class="structname">pg_statistic_ext</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-statistic-ext-data.html">51.51. <code class="structname">pg_statistic_ext_data</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-subscription.html">51.52. <code class="structname">pg_subscription</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-subscription-rel.html">51.53. <code class="structname">pg_subscription_rel</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-tablespace.html">51.54. <code class="structname">pg_tablespace</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-transform.html">51.55. <code class="structname">pg_transform</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-trigger.html">51.56. <code class="structname">pg_trigger</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-config.html">51.57. <code class="structname">pg_ts_config</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-config-map.html">51.58. <code class="structname">pg_ts_config_map</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-dict.html">51.59. <code class="structname">pg_ts_dict</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-parser.html">51.60. <code class="structname">pg_ts_parser</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-template.html">51.61. <code class="structname">pg_ts_template</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-type.html">51.62. <code class="structname">pg_type</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-user-mapping.html">51.63. <code class="structname">pg_user_mapping</code></a></span></dt><dt><span class="sect1"><a href="views-overview.html">51.64. System Views</a></span></dt><dt><span class="sect1"><a href="view-pg-available-extensions.html">51.65. <code class="structname">pg_available_extensions</code></a></span></dt><dt><span class="sect1"><a href="view-pg-available-extension-versions.html">51.66. <code class="structname">pg_available_extension_versions</code></a></span></dt><dt><span class="sect1"><a href="view-pg-config.html">51.67. <code class="structname">pg_config</code></a></span></dt><dt><span class="sect1"><a href="view-pg-cursors.html">51.68. <code class="structname">pg_cursors</code></a></span></dt><dt><span class="sect1"><a href="view-pg-file-settings.html">51.69. <code class="structname">pg_file_settings</code></a></span></dt><dt><span class="sect1"><a href="view-pg-group.html">51.70. <code class="structname">pg_group</code></a></span></dt><dt><span class="sect1"><a href="view-pg-hba-file-rules.html">51.71. <code class="structname">pg_hba_file_rules</code></a></span></dt><dt><span class="sect1"><a href="view-pg-indexes.html">51.72. <code class="structname">pg_indexes</code></a></span></dt><dt><span class="sect1"><a href="view-pg-locks.html">51.73. <code class="structname">pg_locks</code></a></span></dt><dt><span class="sect1"><a href="view-pg-matviews.html">51.74. <code class="structname">pg_matviews</code></a></span></dt><dt><span class="sect1"><a href="view-pg-policies.html">51.75. <code class="structname">pg_policies</code></a></span></dt><dt><span class="sect1"><a href="view-pg-prepared-statements.html">51.76. <code class="structname">pg_prepared_statements</code></a></span></dt><dt><span class="sect1"><a href="view-pg-prepared-xacts.html">51.77. <code class="structname">pg_prepared_xacts</code></a></span></dt><dt><span class="sect1"><a href="view-pg-publication-tables.html">51.78. <code class="structname">pg_publication_tables</code></a></span></dt><dt><span class="sect1"><a href="view-pg-replication-origin-status.html">51.79. <code class="structname">pg_replication_origin_status</code></a></span></dt><dt><span class="sect1"><a href="view-pg-replication-slots.html">51.80. <code class="structname">pg_replication_slots</code></a></span></dt><dt><span class="sect1"><a href="view-pg-roles.html">51.81. <code class="structname">pg_roles</code></a></span></dt><dt><span class="sect1"><a href="view-pg-rules.html">51.82. <code class="structname">pg_rules</code></a></span></dt><dt><span class="sect1"><a href="view-pg-seclabels.html">51.83. <code class="structname">pg_seclabels</code></a></span></dt><dt><span class="sect1"><a href="view-pg-sequences.html">51.84. <code class="structname">pg_sequences</code></a></span></dt><dt><span class="sect1"><a href="view-pg-settings.html">51.85. <code class="structname">pg_settings</code></a></span></dt><dt><span class="sect1"><a href="view-pg-shadow.html">51.86. <code class="structname">pg_shadow</code></a></span></dt><dt><span class="sect1"><a href="view-pg-shmem-allocations.html">51.87. <code class="structname">pg_shmem_allocations</code></a></span></dt><dt><span class="sect1"><a href="view-pg-stats.html">51.88. <code class="structname">pg_stats</code></a></span></dt><dt><span class="sect1"><a href="view-pg-stats-ext.html">51.89. <code class="structname">pg_stats_ext</code></a></span></dt><dt><span class="sect1"><a href="view-pg-tables.html">51.90. <code class="structname">pg_tables</code></a></span></dt><dt><span class="sect1"><a href="view-pg-timezone-abbrevs.html">51.91. <code class="structname">pg_timezone_abbrevs</code></a></span></dt><dt><span class="sect1"><a href="view-pg-timezone-names.html">51.92. <code class="structname">pg_timezone_names</code></a></span></dt><dt><span class="sect1"><a href="view-pg-user.html">51.93. <code class="structname">pg_user</code></a></span></dt><dt><span class="sect1"><a href="view-pg-user-mappings.html">51.94. <code class="structname">pg_user_mappings</code></a></span></dt><dt><span class="sect1"><a href="view-pg-views.html">51.95. <code class="structname">pg_views</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 xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="executor.html" title="50.6. 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="51.1. Overview">Next</a></td></tr><tr><td width="40%" align="left" valign="top">50.6. Executor </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 51.1. Overview</td></tr></table></div></body></html>
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