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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>Part VII. Internals</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="app-postmaster.html" title="postmaster" /><link rel="next" href="overview.html" title="Chapter 51. Overview of PostgreSQL Internals" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">Part VII. Internals</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="app-postmaster.html" title="postmaster">Prev</a> </td><td width="10%" align="left"> </td><th width="60%" align="center"> </th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 11.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="overview.html" title="Chapter 51. Overview of PostgreSQL Internals">Next</a></td></tr></table><hr></hr></div><div class="part" id="INTERNALS"><div class="titlepage"><div><div><h1 class="title">Part VII. Internals</h1></div></div></div><div class="partintro" id="id-1.10.2"><div></div><p>
    This part contains assorted information that might be of use to
    <span class="productname">PostgreSQL</span> developers.
   </p><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="chapter"><a href="overview.html">51. Overview of PostgreSQL Internals</a></span></dt><dd><dl><dt><span class="sect1"><a href="query-path.html">51.1. The Path of a Query</a></span></dt><dt><span class="sect1"><a href="connect-estab.html">51.2. How Connections are Established</a></span></dt><dt><span class="sect1"><a href="parser-stage.html">51.3. The Parser Stage</a></span></dt><dt><span class="sect1"><a href="rule-system.html">51.4. The <span class="productname">PostgreSQL</span> Rule System</a></span></dt><dt><span class="sect1"><a href="planner-optimizer.html">51.5. Planner/Optimizer</a></span></dt><dt><span class="sect1"><a href="executor.html">51.6. Executor</a></span></dt></dl></dd><dt><span class="chapter"><a href="catalogs.html">52. System Catalogs</a></span></dt><dd><dl><dt><span class="sect1"><a href="catalogs-overview.html">52.1. Overview</a></span></dt><dt><span class="sect1"><a href="catalog-pg-aggregate.html">52.2. <code class="structname">pg_aggregate</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-am.html">52.3. <code class="structname">pg_am</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-amop.html">52.4. <code class="structname">pg_amop</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-amproc.html">52.5. <code class="structname">pg_amproc</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-attrdef.html">52.6. <code class="structname">pg_attrdef</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-attribute.html">52.7. <code class="structname">pg_attribute</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-authid.html">52.8. <code class="structname">pg_authid</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-auth-members.html">52.9. <code class="structname">pg_auth_members</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-cast.html">52.10. <code class="structname">pg_cast</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-class.html">52.11. <code class="structname">pg_class</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-collation.html">52.12. <code class="structname">pg_collation</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-constraint.html">52.13. <code class="structname">pg_constraint</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-conversion.html">52.14. <code class="structname">pg_conversion</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-database.html">52.15. <code class="structname">pg_database</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-db-role-setting.html">52.16. <code class="structname">pg_db_role_setting</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-default-acl.html">52.17. <code class="structname">pg_default_acl</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-depend.html">52.18. <code class="structname">pg_depend</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-description.html">52.19. <code class="structname">pg_description</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-enum.html">52.20. <code class="structname">pg_enum</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-event-trigger.html">52.21. <code class="structname">pg_event_trigger</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-extension.html">52.22. <code class="structname">pg_extension</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-foreign-data-wrapper.html">52.23. <code class="structname">pg_foreign_data_wrapper</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-foreign-server.html">52.24. <code class="structname">pg_foreign_server</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-foreign-table.html">52.25. <code class="structname">pg_foreign_table</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-index.html">52.26. <code class="structname">pg_index</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-inherits.html">52.27. <code class="structname">pg_inherits</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-init-privs.html">52.28. <code class="structname">pg_init_privs</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-language.html">52.29. <code class="structname">pg_language</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-largeobject.html">52.30. <code class="structname">pg_largeobject</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-largeobject-metadata.html">52.31. <code class="structname">pg_largeobject_metadata</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-namespace.html">52.32. <code class="structname">pg_namespace</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-opclass.html">52.33. <code class="structname">pg_opclass</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-operator.html">52.34. <code class="structname">pg_operator</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-opfamily.html">52.35. <code class="structname">pg_opfamily</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-partitioned-table.html">52.36. <code class="structname">pg_partitioned_table</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-pltemplate.html">52.37. <code class="structname">pg_pltemplate</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-policy.html">52.38. <code class="structname">pg_policy</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-proc.html">52.39. <code class="structname">pg_proc</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-publication.html">52.40. <code class="structname">pg_publication</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-publication-rel.html">52.41. <code class="structname">pg_publication_rel</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-range.html">52.42. <code class="structname">pg_range</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-replication-origin.html">52.43. <code class="structname">pg_replication_origin</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-rewrite.html">52.44. <code class="structname">pg_rewrite</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-seclabel.html">52.45. <code class="structname">pg_seclabel</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-sequence.html">52.46. <code class="structname">pg_sequence</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-shdepend.html">52.47. <code class="structname">pg_shdepend</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-shdescription.html">52.48. <code class="structname">pg_shdescription</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-shseclabel.html">52.49. <code class="structname">pg_shseclabel</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-statistic.html">52.50. <code class="structname">pg_statistic</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-statistic-ext.html">52.51. <code class="structname">pg_statistic_ext</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-subscription.html">52.52. <code class="structname">pg_subscription</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-subscription-rel.html">52.53. <code class="structname">pg_subscription_rel</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-tablespace.html">52.54. <code class="structname">pg_tablespace</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-transform.html">52.55. <code class="structname">pg_transform</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-trigger.html">52.56. <code class="structname">pg_trigger</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-config.html">52.57. <code class="structname">pg_ts_config</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-config-map.html">52.58. <code class="structname">pg_ts_config_map</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-dict.html">52.59. <code class="structname">pg_ts_dict</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-parser.html">52.60. <code class="structname">pg_ts_parser</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-ts-template.html">52.61. <code class="structname">pg_ts_template</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-type.html">52.62. <code class="structname">pg_type</code></a></span></dt><dt><span class="sect1"><a href="catalog-pg-user-mapping.html">52.63. <code class="structname">pg_user_mapping</code></a></span></dt><dt><span class="sect1"><a href="views-overview.html">52.64. System Views</a></span></dt><dt><span class="sect1"><a href="view-pg-available-extensions.html">52.65. <code class="structname">pg_available_extensions</code></a></span></dt><dt><span class="sect1"><a href="view-pg-available-extension-versions.html">52.66. <code class="structname">pg_available_extension_versions</code></a></span></dt><dt><span class="sect1"><a href="view-pg-config.html">52.67. <code class="structname">pg_config</code></a></span></dt><dt><span class="sect1"><a href="view-pg-cursors.html">52.68. <code class="structname">pg_cursors</code></a></span></dt><dt><span class="sect1"><a href="view-pg-file-settings.html">52.69. <code class="structname">pg_file_settings</code></a></span></dt><dt><span class="sect1"><a href="view-pg-group.html">52.70. <code class="structname">pg_group</code></a></span></dt><dt><span class="sect1"><a href="view-pg-hba-file-rules.html">52.71. <code class="structname">pg_hba_file_rules</code></a></span></dt><dt><span class="sect1"><a href="view-pg-indexes.html">52.72. <code class="structname">pg_indexes</code></a></span></dt><dt><span class="sect1"><a href="view-pg-locks.html">52.73. <code class="structname">pg_locks</code></a></span></dt><dt><span class="sect1"><a href="view-pg-matviews.html">52.74. <code class="structname">pg_matviews</code></a></span></dt><dt><span class="sect1"><a href="view-pg-policies.html">52.75. <code class="structname">pg_policies</code></a></span></dt><dt><span class="sect1"><a href="view-pg-prepared-statements.html">52.76. <code class="structname">pg_prepared_statements</code></a></span></dt><dt><span class="sect1"><a href="view-pg-prepared-xacts.html">52.77. <code class="structname">pg_prepared_xacts</code></a></span></dt><dt><span class="sect1"><a href="view-pg-publication-tables.html">52.78. <code class="structname">pg_publication_tables</code></a></span></dt><dt><span class="sect1"><a href="view-pg-replication-origin-status.html">52.79. <code class="structname">pg_replication_origin_status</code></a></span></dt><dt><span class="sect1"><a href="view-pg-replication-slots.html">52.80. <code class="structname">pg_replication_slots</code></a></span></dt><dt><span class="sect1"><a href="view-pg-roles.html">52.81. <code class="structname">pg_roles</code></a></span></dt><dt><span class="sect1"><a href="view-pg-rules.html">52.82. <code class="structname">pg_rules</code></a></span></dt><dt><span class="sect1"><a href="view-pg-seclabels.html">52.83. <code class="structname">pg_seclabels</code></a></span></dt><dt><span class="sect1"><a href="view-pg-sequences.html">52.84. <code class="structname">pg_sequences</code></a></span></dt><dt><span class="sect1"><a href="view-pg-settings.html">52.85. <code class="structname">pg_settings</code></a></span></dt><dt><span class="sect1"><a href="view-pg-shadow.html">52.86. <code class="structname">pg_shadow</code></a></span></dt><dt><span class="sect1"><a href="view-pg-stats.html">52.87. <code class="structname">pg_stats</code></a></span></dt><dt><span class="sect1"><a href="view-pg-tables.html">52.88. <code class="structname">pg_tables</code></a></span></dt><dt><span class="sect1"><a href="view-pg-timezone-abbrevs.html">52.89. <code class="structname">pg_timezone_abbrevs</code></a></span></dt><dt><span class="sect1"><a href="view-pg-timezone-names.html">52.90. <code class="structname">pg_timezone_names</code></a></span></dt><dt><span class="sect1"><a href="view-pg-user.html">52.91. <code class="structname">pg_user</code></a></span></dt><dt><span class="sect1"><a href="view-pg-user-mappings.html">52.92. <code class="structname">pg_user_mappings</code></a></span></dt><dt><span class="sect1"><a href="view-pg-views.html">52.93. <code class="structname">pg_views</code></a></span></dt></dl></dd><dt><span class="chapter"><a href="protocol.html">53. Frontend/Backend Protocol</a></span></dt><dd><dl><dt><span class="sect1"><a href="protocol-overview.html">53.1. Overview</a></span></dt><dt><span class="sect1"><a href="protocol-flow.html">53.2. Message Flow</a></span></dt><dt><span class="sect1"><a href="sasl-authentication.html">53.3. SASL Authentication</a></span></dt><dt><span class="sect1"><a href="protocol-replication.html">53.4. Streaming Replication Protocol</a></span></dt><dt><span class="sect1"><a href="protocol-logical-replication.html">53.5. Logical Streaming Replication Protocol</a></span></dt><dt><span class="sect1"><a href="protocol-message-types.html">53.6. Message Data Types</a></span></dt><dt><span class="sect1"><a href="protocol-message-formats.html">53.7. Message Formats</a></span></dt><dt><span class="sect1"><a href="protocol-error-fields.html">53.8. Error and Notice Message Fields</a></span></dt><dt><span class="sect1"><a href="protocol-logicalrep-message-formats.html">53.9. Logical Replication Message Formats</a></span></dt><dt><span class="sect1"><a href="protocol-changes.html">53.10. Summary of Changes since Protocol 2.0</a></span></dt></dl></dd><dt><span class="chapter"><a href="source.html">54. PostgreSQL Coding Conventions</a></span></dt><dd><dl><dt><span class="sect1"><a href="source-format.html">54.1. Formatting</a></span></dt><dt><span class="sect1"><a href="error-message-reporting.html">54.2. Reporting Errors Within the Server</a></span></dt><dt><span class="sect1"><a href="error-style-guide.html">54.3. Error Message Style Guide</a></span></dt><dt><span class="sect1"><a href="source-conventions.html">54.4. Miscellaneous Coding Conventions</a></span></dt></dl></dd><dt><span class="chapter"><a href="nls.html">55. Native Language Support</a></span></dt><dd><dl><dt><span class="sect1"><a href="nls-translator.html">55.1. For the Translator</a></span></dt><dt><span class="sect1"><a href="nls-programmer.html">55.2. For the Programmer</a></span></dt></dl></dd><dt><span class="chapter"><a href="plhandler.html">56. Writing A Procedural Language Handler</a></span></dt><dt><span class="chapter"><a href="fdwhandler.html">57. Writing A Foreign Data Wrapper</a></span></dt><dd><dl><dt><span class="sect1"><a href="fdw-functions.html">57.1. Foreign Data Wrapper Functions</a></span></dt><dt><span class="sect1"><a href="fdw-callbacks.html">57.2. Foreign Data Wrapper Callback Routines</a></span></dt><dt><span class="sect1"><a href="fdw-helpers.html">57.3. Foreign Data Wrapper Helper Functions</a></span></dt><dt><span class="sect1"><a href="fdw-planning.html">57.4. Foreign Data Wrapper Query Planning</a></span></dt><dt><span class="sect1"><a href="fdw-row-locking.html">57.5. Row Locking in Foreign Data Wrappers</a></span></dt></dl></dd><dt><span class="chapter"><a href="tablesample-method.html">58. Writing A Table Sampling Method</a></span></dt><dd><dl><dt><span class="sect1"><a href="tablesample-support-functions.html">58.1. Sampling Method Support Functions</a></span></dt></dl></dd><dt><span class="chapter"><a href="custom-scan.html">59. Writing A Custom Scan Provider</a></span></dt><dd><dl><dt><span class="sect1"><a href="custom-scan-path.html">59.1. Creating Custom Scan Paths</a></span></dt><dt><span class="sect1"><a href="custom-scan-plan.html">59.2. Creating Custom Scan Plans</a></span></dt><dt><span class="sect1"><a href="custom-scan-execution.html">59.3. Executing Custom Scans</a></span></dt></dl></dd><dt><span class="chapter"><a href="geqo.html">60. Genetic Query Optimizer</a></span></dt><dd><dl><dt><span class="sect1"><a href="geqo-intro.html">60.1. Query Handling as a Complex Optimization Problem</a></span></dt><dt><span class="sect1"><a href="geqo-intro2.html">60.2. Genetic Algorithms</a></span></dt><dt><span class="sect1"><a href="geqo-pg-intro.html">60.3. Genetic Query Optimization (<acronym class="acronym">GEQO</acronym>) in PostgreSQL</a></span></dt><dt><span class="sect1"><a href="geqo-biblio.html">60.4. Further Reading</a></span></dt></dl></dd><dt><span class="chapter"><a href="indexam.html">61. Index Access Method Interface Definition</a></span></dt><dd><dl><dt><span class="sect1"><a href="index-api.html">61.1. Basic API Structure for Indexes</a></span></dt><dt><span class="sect1"><a href="index-functions.html">61.2. Index Access Method Functions</a></span></dt><dt><span class="sect1"><a href="index-scanning.html">61.3. Index Scanning</a></span></dt><dt><span class="sect1"><a href="index-locking.html">61.4. Index Locking Considerations</a></span></dt><dt><span class="sect1"><a href="index-unique-checks.html">61.5. Index Uniqueness Checks</a></span></dt><dt><span class="sect1"><a href="index-cost-estimation.html">61.6. Index Cost Estimation Functions</a></span></dt></dl></dd><dt><span class="chapter"><a href="generic-wal.html">62. Generic WAL Records</a></span></dt><dt><span class="chapter"><a href="btree.html">63. B-Tree Indexes</a></span></dt><dd><dl><dt><span class="sect1"><a href="btree-intro.html">63.1. Introduction</a></span></dt><dt><span class="sect1"><a href="btree-behavior.html">63.2. Behavior of B-Tree Operator Classes</a></span></dt><dt><span class="sect1"><a href="btree-support-funcs.html">63.3. B-Tree Support Functions</a></span></dt><dt><span class="sect1"><a href="btree-implementation.html">63.4. Implementation</a></span></dt></dl></dd><dt><span class="chapter"><a href="gist.html">64. GiST Indexes</a></span></dt><dd><dl><dt><span class="sect1"><a href="gist-intro.html">64.1. Introduction</a></span></dt><dt><span class="sect1"><a href="gist-builtin-opclasses.html">64.2. Built-in Operator Classes</a></span></dt><dt><span class="sect1"><a href="gist-extensibility.html">64.3. Extensibility</a></span></dt><dt><span class="sect1"><a href="gist-implementation.html">64.4. Implementation</a></span></dt><dt><span class="sect1"><a href="gist-examples.html">64.5. Examples</a></span></dt></dl></dd><dt><span class="chapter"><a href="spgist.html">65. SP-GiST Indexes</a></span></dt><dd><dl><dt><span class="sect1"><a href="spgist-intro.html">65.1. Introduction</a></span></dt><dt><span class="sect1"><a href="spgist-builtin-opclasses.html">65.2. Built-in Operator Classes</a></span></dt><dt><span class="sect1"><a href="spgist-extensibility.html">65.3. Extensibility</a></span></dt><dt><span class="sect1"><a href="spgist-implementation.html">65.4. Implementation</a></span></dt><dt><span class="sect1"><a href="spgist-examples.html">65.5. Examples</a></span></dt></dl></dd><dt><span class="chapter"><a href="gin.html">66. GIN Indexes</a></span></dt><dd><dl><dt><span class="sect1"><a href="gin-intro.html">66.1. Introduction</a></span></dt><dt><span class="sect1"><a href="gin-builtin-opclasses.html">66.2. Built-in Operator Classes</a></span></dt><dt><span class="sect1"><a href="gin-extensibility.html">66.3. Extensibility</a></span></dt><dt><span class="sect1"><a href="gin-implementation.html">66.4. Implementation</a></span></dt><dt><span class="sect1"><a href="gin-tips.html">66.5. GIN Tips and Tricks</a></span></dt><dt><span class="sect1"><a href="gin-limit.html">66.6. Limitations</a></span></dt><dt><span class="sect1"><a href="gin-examples.html">66.7. Examples</a></span></dt></dl></dd><dt><span class="chapter"><a href="brin.html">67. BRIN Indexes</a></span></dt><dd><dl><dt><span class="sect1"><a href="brin-intro.html">67.1. Introduction</a></span></dt><dt><span class="sect1"><a href="brin-builtin-opclasses.html">67.2. Built-in Operator Classes</a></span></dt><dt><span class="sect1"><a href="brin-extensibility.html">67.3. Extensibility</a></span></dt></dl></dd><dt><span class="chapter"><a href="storage.html">68. Database Physical Storage</a></span></dt><dd><dl><dt><span class="sect1"><a href="storage-file-layout.html">68.1. Database File Layout</a></span></dt><dt><span class="sect1"><a href="storage-toast.html">68.2. TOAST</a></span></dt><dt><span class="sect1"><a href="storage-fsm.html">68.3. Free Space Map</a></span></dt><dt><span class="sect1"><a href="storage-vm.html">68.4. Visibility Map</a></span></dt><dt><span class="sect1"><a href="storage-init.html">68.5. The Initialization Fork</a></span></dt><dt><span class="sect1"><a href="storage-page-layout.html">68.6. Database Page Layout</a></span></dt></dl></dd><dt><span class="chapter"><a href="bki.html">69. System Catalog Declarations and Initial Contents</a></span></dt><dd><dl><dt><span class="sect1"><a href="system-catalog-declarations.html">69.1. System Catalog Declaration Rules</a></span></dt><dt><span class="sect1"><a href="system-catalog-initial-data.html">69.2. System Catalog Initial Data</a></span></dt><dt><span class="sect1"><a href="bki-format.html">69.3. <acronym class="acronym">BKI</acronym> File Format</a></span></dt><dt><span class="sect1"><a href="bki-commands.html">69.4. <acronym class="acronym">BKI</acronym> Commands</a></span></dt><dt><span class="sect1"><a href="bki-structure.html">69.5. Structure of the Bootstrap <acronym class="acronym">BKI</acronym> File</a></span></dt><dt><span class="sect1"><a href="bki-example.html">69.6. BKI Example</a></span></dt></dl></dd><dt><span class="chapter"><a href="planner-stats-details.html">70. How the Planner Uses Statistics</a></span></dt><dd><dl><dt><span class="sect1"><a href="row-estimation-examples.html">70.1. Row Estimation Examples</a></span></dt><dt><span class="sect1"><a href="multivariate-statistics-examples.html">70.2. Multivariate Statistics Examples</a></span></dt><dt><span class="sect1"><a href="planner-stats-security.html">70.3. Planner Statistics and Security</a></span></dt></dl></dd></dl></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="app-postmaster.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="overview.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="application">postmaster</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 51. Overview of PostgreSQL Internals</td></tr></table></div></body></html>