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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>Appendix F. Additional Supplied Modules</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="release-prior.html" title="E.6. Prior Releases" /><link rel="next" href="adminpack.html" title="F.1. adminpack" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">Appendix F. Additional Supplied Modules</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="release-prior.html" title="E.6. Prior Releases">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="appendixes.html" title="Part VIII. Appendixes">Up</a></td><th width="60%" align="center">Part VIII. Appendixes</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="adminpack.html" title="F.1. adminpack">Next</a></td></tr></table><hr /></div><div class="appendix" id="CONTRIB"><div class="titlepage"><div><div><h2 class="title">Appendix F. Additional Supplied Modules</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="adminpack.html">F.1. adminpack</a></span></dt><dt><span class="sect1"><a href="amcheck.html">F.2. amcheck</a></span></dt><dd><dl><dt><span class="sect2"><a href="amcheck.html#id-1.11.7.11.8">F.2.1. Functions</a></span></dt><dt><span class="sect2"><a href="amcheck.html#id-1.11.7.11.9">F.2.2. Optional <em class="parameter"><code>heapallindexed</code></em> Verification</a></span></dt><dt><span class="sect2"><a href="amcheck.html#id-1.11.7.11.10">F.2.3. Using <code class="filename">amcheck</code> Effectively</a></span></dt><dt><span class="sect2"><a href="amcheck.html#id-1.11.7.11.11">F.2.4. Repairing Corruption</a></span></dt></dl></dd><dt><span class="sect1"><a href="auth-delay.html">F.3. auth_delay</a></span></dt><dd><dl><dt><span class="sect2"><a href="auth-delay.html#id-1.11.7.12.5">F.3.1. Configuration Parameters</a></span></dt><dt><span class="sect2"><a href="auth-delay.html#id-1.11.7.12.6">F.3.2. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="auto-explain.html">F.4. auto_explain</a></span></dt><dd><dl><dt><span class="sect2"><a href="auto-explain.html#id-1.11.7.13.5">F.4.1. Configuration Parameters</a></span></dt><dt><span class="sect2"><a href="auto-explain.html#id-1.11.7.13.6">F.4.2. Example</a></span></dt><dt><span class="sect2"><a href="auto-explain.html#id-1.11.7.13.7">F.4.3. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="basebackup-to-shell.html">F.5. basebackup_to_shell</a></span></dt><dd><dl><dt><span class="sect2"><a href="basebackup-to-shell.html#id-1.11.7.14.5">F.5.1. Configuration Parameters</a></span></dt><dt><span class="sect2"><a href="basebackup-to-shell.html#id-1.11.7.14.6">F.5.2. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="basic-archive.html">F.6. basic_archive</a></span></dt><dd><dl><dt><span class="sect2"><a href="basic-archive.html#id-1.11.7.15.5">F.6.1. Configuration Parameters</a></span></dt><dt><span class="sect2"><a href="basic-archive.html#id-1.11.7.15.6">F.6.2. Notes</a></span></dt><dt><span class="sect2"><a href="basic-archive.html#id-1.11.7.15.7">F.6.3. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="bloom.html">F.7. bloom</a></span></dt><dd><dl><dt><span class="sect2"><a href="bloom.html#id-1.11.7.16.7">F.7.1. Parameters</a></span></dt><dt><span class="sect2"><a href="bloom.html#id-1.11.7.16.8">F.7.2. Examples</a></span></dt><dt><span class="sect2"><a href="bloom.html#id-1.11.7.16.9">F.7.3. Operator Class Interface</a></span></dt><dt><span class="sect2"><a href="bloom.html#id-1.11.7.16.10">F.7.4. Limitations</a></span></dt><dt><span class="sect2"><a href="bloom.html#id-1.11.7.16.11">F.7.5. Authors</a></span></dt></dl></dd><dt><span class="sect1"><a href="btree-gin.html">F.8. btree_gin</a></span></dt><dd><dl><dt><span class="sect2"><a href="btree-gin.html#id-1.11.7.17.6">F.8.1. Example Usage</a></span></dt><dt><span class="sect2"><a href="btree-gin.html#id-1.11.7.17.7">F.8.2. Authors</a></span></dt></dl></dd><dt><span class="sect1"><a href="btree-gist.html">F.9. btree_gist</a></span></dt><dd><dl><dt><span class="sect2"><a href="btree-gist.html#id-1.11.7.18.8">F.9.1. Example Usage</a></span></dt><dt><span class="sect2"><a href="btree-gist.html#id-1.11.7.18.9">F.9.2. Authors</a></span></dt></dl></dd><dt><span class="sect1"><a href="citext.html">F.10. citext</a></span></dt><dd><dl><dt><span class="sect2"><a href="citext.html#id-1.11.7.19.6">F.10.1. Rationale</a></span></dt><dt><span class="sect2"><a href="citext.html#id-1.11.7.19.7">F.10.2. How to Use It</a></span></dt><dt><span class="sect2"><a href="citext.html#id-1.11.7.19.8">F.10.3. String Comparison Behavior</a></span></dt><dt><span class="sect2"><a href="citext.html#id-1.11.7.19.9">F.10.4. Limitations</a></span></dt><dt><span class="sect2"><a href="citext.html#id-1.11.7.19.10">F.10.5. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="cube.html">F.11. cube</a></span></dt><dd><dl><dt><span class="sect2"><a href="cube.html#id-1.11.7.20.5">F.11.1. Syntax</a></span></dt><dt><span class="sect2"><a href="cube.html#id-1.11.7.20.6">F.11.2. Precision</a></span></dt><dt><span class="sect2"><a href="cube.html#id-1.11.7.20.7">F.11.3. Usage</a></span></dt><dt><span class="sect2"><a href="cube.html#id-1.11.7.20.8">F.11.4. Defaults</a></span></dt><dt><span class="sect2"><a href="cube.html#id-1.11.7.20.9">F.11.5. Notes</a></span></dt><dt><span class="sect2"><a href="cube.html#id-1.11.7.20.10">F.11.6. Credits</a></span></dt></dl></dd><dt><span class="sect1"><a href="dblink.html">F.12. dblink</a></span></dt><dd><dl><dt><span class="refentrytitle"><a href="contrib-dblink-connect.html">dblink_connect</a></span><span class="refpurpose"> — opens a persistent connection to a remote database</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-connect-u.html">dblink_connect_u</a></span><span class="refpurpose"> — opens a persistent connection to a remote database, insecurely</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-disconnect.html">dblink_disconnect</a></span><span class="refpurpose"> — closes a persistent connection to a remote database</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-function.html">dblink</a></span><span class="refpurpose"> — executes a query in a remote database</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-exec.html">dblink_exec</a></span><span class="refpurpose"> — executes a command in a remote database</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-open.html">dblink_open</a></span><span class="refpurpose"> — opens a cursor in a remote database</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-fetch.html">dblink_fetch</a></span><span class="refpurpose"> — returns rows from an open cursor in a remote database</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-close.html">dblink_close</a></span><span class="refpurpose"> — closes a cursor in a remote database</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-get-connections.html">dblink_get_connections</a></span><span class="refpurpose"> — returns the names of all open named dblink connections</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-error-message.html">dblink_error_message</a></span><span class="refpurpose"> — gets last error message on the named connection</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-send-query.html">dblink_send_query</a></span><span class="refpurpose"> — sends an async query to a remote database</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-is-busy.html">dblink_is_busy</a></span><span class="refpurpose"> — checks if connection is busy with an async query</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-get-notify.html">dblink_get_notify</a></span><span class="refpurpose"> — retrieve async notifications on a connection</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-get-result.html">dblink_get_result</a></span><span class="refpurpose"> — gets an async query result</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-cancel-query.html">dblink_cancel_query</a></span><span class="refpurpose"> — cancels any active query on the named connection</span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-get-pkey.html">dblink_get_pkey</a></span><span class="refpurpose"> — returns the positions and field names of a relation's
+    primary key fields
+   </span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-build-sql-insert.html">dblink_build_sql_insert</a></span><span class="refpurpose"> — 
+    builds an INSERT statement using a local tuple, replacing the
+    primary key field values with alternative supplied values
+   </span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-build-sql-delete.html">dblink_build_sql_delete</a></span><span class="refpurpose"> — builds a DELETE statement using supplied values for primary
+    key field values
+   </span></dt><dt><span class="refentrytitle"><a href="contrib-dblink-build-sql-update.html">dblink_build_sql_update</a></span><span class="refpurpose"> — builds an UPDATE statement using a local tuple, replacing
+    the primary key field values with alternative supplied values
+   </span></dt></dl></dd><dt><span class="sect1"><a href="dict-int.html">F.13. dict_int</a></span></dt><dd><dl><dt><span class="sect2"><a href="dict-int.html#id-1.11.7.22.5">F.13.1. Configuration</a></span></dt><dt><span class="sect2"><a href="dict-int.html#id-1.11.7.22.6">F.13.2. Usage</a></span></dt></dl></dd><dt><span class="sect1"><a href="dict-xsyn.html">F.14. dict_xsyn</a></span></dt><dd><dl><dt><span class="sect2"><a href="dict-xsyn.html#id-1.11.7.23.4">F.14.1. Configuration</a></span></dt><dt><span class="sect2"><a href="dict-xsyn.html#id-1.11.7.23.5">F.14.2. Usage</a></span></dt></dl></dd><dt><span class="sect1"><a href="earthdistance.html">F.15. earthdistance</a></span></dt><dd><dl><dt><span class="sect2"><a href="earthdistance.html#id-1.11.7.24.7">F.15.1. Cube-Based Earth Distances</a></span></dt><dt><span class="sect2"><a href="earthdistance.html#id-1.11.7.24.8">F.15.2. Point-Based Earth Distances</a></span></dt></dl></dd><dt><span class="sect1"><a href="file-fdw.html">F.16. file_fdw</a></span></dt><dt><span class="sect1"><a href="fuzzystrmatch.html">F.17. fuzzystrmatch</a></span></dt><dd><dl><dt><span class="sect2"><a href="fuzzystrmatch.html#id-1.11.7.26.6">F.17.1. Soundex</a></span></dt><dt><span class="sect2"><a href="fuzzystrmatch.html#id-1.11.7.26.7">F.17.2. Levenshtein</a></span></dt><dt><span class="sect2"><a href="fuzzystrmatch.html#id-1.11.7.26.8">F.17.3. Metaphone</a></span></dt><dt><span class="sect2"><a href="fuzzystrmatch.html#id-1.11.7.26.9">F.17.4. Double Metaphone</a></span></dt></dl></dd><dt><span class="sect1"><a href="hstore.html">F.18. hstore</a></span></dt><dd><dl><dt><span class="sect2"><a href="hstore.html#id-1.11.7.27.5">F.18.1. <code class="type">hstore</code> External Representation</a></span></dt><dt><span class="sect2"><a href="hstore.html#id-1.11.7.27.6">F.18.2. <code class="type">hstore</code> Operators and Functions</a></span></dt><dt><span class="sect2"><a href="hstore.html#id-1.11.7.27.7">F.18.3. Indexes</a></span></dt><dt><span class="sect2"><a href="hstore.html#id-1.11.7.27.8">F.18.4. Examples</a></span></dt><dt><span class="sect2"><a href="hstore.html#id-1.11.7.27.9">F.18.5. Statistics</a></span></dt><dt><span class="sect2"><a href="hstore.html#id-1.11.7.27.10">F.18.6. Compatibility</a></span></dt><dt><span class="sect2"><a href="hstore.html#id-1.11.7.27.11">F.18.7. Transforms</a></span></dt><dt><span class="sect2"><a href="hstore.html#id-1.11.7.27.12">F.18.8. Authors</a></span></dt></dl></dd><dt><span class="sect1"><a href="intagg.html">F.19. intagg</a></span></dt><dd><dl><dt><span class="sect2"><a href="intagg.html#id-1.11.7.28.4">F.19.1. Functions</a></span></dt><dt><span class="sect2"><a href="intagg.html#id-1.11.7.28.5">F.19.2. Sample Uses</a></span></dt></dl></dd><dt><span class="sect1"><a href="intarray.html">F.20. intarray</a></span></dt><dd><dl><dt><span class="sect2"><a href="intarray.html#id-1.11.7.29.7">F.20.1. <code class="filename">intarray</code> Functions and Operators</a></span></dt><dt><span class="sect2"><a href="intarray.html#id-1.11.7.29.8">F.20.2. Index Support</a></span></dt><dt><span class="sect2"><a href="intarray.html#id-1.11.7.29.9">F.20.3. Example</a></span></dt><dt><span class="sect2"><a href="intarray.html#id-1.11.7.29.10">F.20.4. Benchmark</a></span></dt><dt><span class="sect2"><a href="intarray.html#id-1.11.7.29.11">F.20.5. Authors</a></span></dt></dl></dd><dt><span class="sect1"><a href="isn.html">F.21. isn</a></span></dt><dd><dl><dt><span class="sect2"><a href="isn.html#id-1.11.7.30.5">F.21.1. Data Types</a></span></dt><dt><span class="sect2"><a href="isn.html#id-1.11.7.30.6">F.21.2. Casts</a></span></dt><dt><span class="sect2"><a href="isn.html#id-1.11.7.30.7">F.21.3. Functions and Operators</a></span></dt><dt><span class="sect2"><a href="isn.html#id-1.11.7.30.8">F.21.4. Examples</a></span></dt><dt><span class="sect2"><a href="isn.html#id-1.11.7.30.9">F.21.5. Bibliography</a></span></dt><dt><span class="sect2"><a href="isn.html#id-1.11.7.30.10">F.21.6. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="lo.html">F.22. lo</a></span></dt><dd><dl><dt><span class="sect2"><a href="lo.html#id-1.11.7.31.5">F.22.1. Rationale</a></span></dt><dt><span class="sect2"><a href="lo.html#id-1.11.7.31.6">F.22.2. How to Use It</a></span></dt><dt><span class="sect2"><a href="lo.html#id-1.11.7.31.7">F.22.3. Limitations</a></span></dt><dt><span class="sect2"><a href="lo.html#id-1.11.7.31.8">F.22.4. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="ltree.html">F.23. ltree</a></span></dt><dd><dl><dt><span class="sect2"><a href="ltree.html#id-1.11.7.32.5">F.23.1. Definitions</a></span></dt><dt><span class="sect2"><a href="ltree.html#id-1.11.7.32.6">F.23.2. Operators and Functions</a></span></dt><dt><span class="sect2"><a href="ltree.html#id-1.11.7.32.7">F.23.3. Indexes</a></span></dt><dt><span class="sect2"><a href="ltree.html#id-1.11.7.32.8">F.23.4. Example</a></span></dt><dt><span class="sect2"><a href="ltree.html#id-1.11.7.32.9">F.23.5. Transforms</a></span></dt><dt><span class="sect2"><a href="ltree.html#id-1.11.7.32.10">F.23.6. Authors</a></span></dt></dl></dd><dt><span class="sect1"><a href="oldsnapshot.html">F.24. old_snapshot</a></span></dt><dd><dl><dt><span class="sect2"><a href="oldsnapshot.html#id-1.11.7.33.4">F.24.1. Functions</a></span></dt></dl></dd><dt><span class="sect1"><a href="pageinspect.html">F.25. pageinspect</a></span></dt><dd><dl><dt><span class="sect2"><a href="pageinspect.html#id-1.11.7.34.4">F.25.1. General Functions</a></span></dt><dt><span class="sect2"><a href="pageinspect.html#id-1.11.7.34.5">F.25.2. Heap Functions</a></span></dt><dt><span class="sect2"><a href="pageinspect.html#id-1.11.7.34.6">F.25.3. B-Tree Functions</a></span></dt><dt><span class="sect2"><a href="pageinspect.html#id-1.11.7.34.7">F.25.4. BRIN Functions</a></span></dt><dt><span class="sect2"><a href="pageinspect.html#id-1.11.7.34.8">F.25.5. GIN Functions</a></span></dt><dt><span class="sect2"><a href="pageinspect.html#id-1.11.7.34.9">F.25.6. GiST Functions</a></span></dt><dt><span class="sect2"><a href="pageinspect.html#id-1.11.7.34.10">F.25.7. Hash Functions</a></span></dt></dl></dd><dt><span class="sect1"><a href="passwordcheck.html">F.26. passwordcheck</a></span></dt><dt><span class="sect1"><a href="pgbuffercache.html">F.27. pg_buffercache</a></span></dt><dd><dl><dt><span class="sect2"><a href="pgbuffercache.html#id-1.11.7.36.7">F.27.1. The <code class="structname">pg_buffercache</code> View</a></span></dt><dt><span class="sect2"><a href="pgbuffercache.html#id-1.11.7.36.8">F.27.2. Sample Output</a></span></dt><dt><span class="sect2"><a href="pgbuffercache.html#id-1.11.7.36.9">F.27.3. Authors</a></span></dt></dl></dd><dt><span class="sect1"><a href="pgcrypto.html">F.28. pgcrypto</a></span></dt><dd><dl><dt><span class="sect2"><a href="pgcrypto.html#id-1.11.7.37.7">F.28.1. General Hashing Functions</a></span></dt><dt><span class="sect2"><a href="pgcrypto.html#id-1.11.7.37.8">F.28.2. Password Hashing Functions</a></span></dt><dt><span class="sect2"><a href="pgcrypto.html#id-1.11.7.37.9">F.28.3. PGP Encryption Functions</a></span></dt><dt><span class="sect2"><a href="pgcrypto.html#id-1.11.7.37.10">F.28.4. Raw Encryption Functions</a></span></dt><dt><span class="sect2"><a href="pgcrypto.html#id-1.11.7.37.11">F.28.5. Random-Data Functions</a></span></dt><dt><span class="sect2"><a href="pgcrypto.html#id-1.11.7.37.12">F.28.6. Notes</a></span></dt><dt><span class="sect2"><a href="pgcrypto.html#id-1.11.7.37.13">F.28.7. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="pgfreespacemap.html">F.29. pg_freespacemap</a></span></dt><dd><dl><dt><span class="sect2"><a href="pgfreespacemap.html#id-1.11.7.38.5">F.29.1. Functions</a></span></dt><dt><span class="sect2"><a href="pgfreespacemap.html#id-1.11.7.38.6">F.29.2. Sample Output</a></span></dt><dt><span class="sect2"><a href="pgfreespacemap.html#id-1.11.7.38.7">F.29.3. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="pgprewarm.html">F.30. pg_prewarm</a></span></dt><dd><dl><dt><span class="sect2"><a href="pgprewarm.html#id-1.11.7.39.4">F.30.1. Functions</a></span></dt><dt><span class="sect2"><a href="pgprewarm.html#id-1.11.7.39.5">F.30.2. Configuration Parameters</a></span></dt><dt><span class="sect2"><a href="pgprewarm.html#id-1.11.7.39.6">F.30.3. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="pgrowlocks.html">F.31. pgrowlocks</a></span></dt><dd><dl><dt><span class="sect2"><a href="pgrowlocks.html#id-1.11.7.40.5">F.31.1. Overview</a></span></dt><dt><span class="sect2"><a href="pgrowlocks.html#id-1.11.7.40.6">F.31.2. Sample Output</a></span></dt><dt><span class="sect2"><a href="pgrowlocks.html#id-1.11.7.40.7">F.31.3. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="pgstatstatements.html">F.32. pg_stat_statements</a></span></dt><dd><dl><dt><span class="sect2"><a href="pgstatstatements.html#id-1.11.7.41.6">F.32.1. The <code class="structname">pg_stat_statements</code> View</a></span></dt><dt><span class="sect2"><a href="pgstatstatements.html#id-1.11.7.41.7">F.32.2. The <code class="structname">pg_stat_statements_info</code> View</a></span></dt><dt><span class="sect2"><a href="pgstatstatements.html#id-1.11.7.41.8">F.32.3. Functions</a></span></dt><dt><span class="sect2"><a href="pgstatstatements.html#id-1.11.7.41.9">F.32.4. Configuration Parameters</a></span></dt><dt><span class="sect2"><a href="pgstatstatements.html#id-1.11.7.41.10">F.32.5. Sample Output</a></span></dt><dt><span class="sect2"><a href="pgstatstatements.html#id-1.11.7.41.11">F.32.6. Authors</a></span></dt></dl></dd><dt><span class="sect1"><a href="pgstattuple.html">F.33. pgstattuple</a></span></dt><dd><dl><dt><span class="sect2"><a href="pgstattuple.html#id-1.11.7.42.5">F.33.1. Functions</a></span></dt><dt><span class="sect2"><a href="pgstattuple.html#id-1.11.7.42.6">F.33.2. Authors</a></span></dt></dl></dd><dt><span class="sect1"><a href="pgsurgery.html">F.34. pg_surgery</a></span></dt><dd><dl><dt><span class="sect2"><a href="pgsurgery.html#id-1.11.7.43.4">F.34.1. Functions</a></span></dt><dt><span class="sect2"><a href="pgsurgery.html#id-1.11.7.43.5">F.34.2. Authors</a></span></dt></dl></dd><dt><span class="sect1"><a href="pgtrgm.html">F.35. pg_trgm</a></span></dt><dd><dl><dt><span class="sect2"><a href="pgtrgm.html#id-1.11.7.44.5">F.35.1. Trigram (or Trigraph) Concepts</a></span></dt><dt><span class="sect2"><a href="pgtrgm.html#id-1.11.7.44.6">F.35.2. Functions and Operators</a></span></dt><dt><span class="sect2"><a href="pgtrgm.html#id-1.11.7.44.7">F.35.3. GUC Parameters</a></span></dt><dt><span class="sect2"><a href="pgtrgm.html#id-1.11.7.44.8">F.35.4. Index Support</a></span></dt><dt><span class="sect2"><a href="pgtrgm.html#id-1.11.7.44.9">F.35.5. Text Search Integration</a></span></dt><dt><span class="sect2"><a href="pgtrgm.html#id-1.11.7.44.10">F.35.6. References</a></span></dt><dt><span class="sect2"><a href="pgtrgm.html#id-1.11.7.44.11">F.35.7. Authors</a></span></dt></dl></dd><dt><span class="sect1"><a href="pgvisibility.html">F.36. pg_visibility</a></span></dt><dd><dl><dt><span class="sect2"><a href="pgvisibility.html#id-1.11.7.45.6">F.36.1. Functions</a></span></dt><dt><span class="sect2"><a href="pgvisibility.html#id-1.11.7.45.7">F.36.2. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="pgwalinspect.html">F.37. pg_walinspect</a></span></dt><dd><dl><dt><span class="sect2"><a href="pgwalinspect.html#id-1.11.7.46.8">F.37.1. General Functions</a></span></dt><dt><span class="sect2"><a href="pgwalinspect.html#id-1.11.7.46.9">F.37.2. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="postgres-fdw.html">F.38. postgres_fdw</a></span></dt><dd><dl><dt><span class="sect2"><a href="postgres-fdw.html#id-1.11.7.47.11">F.38.1. FDW Options of postgres_fdw</a></span></dt><dt><span class="sect2"><a href="postgres-fdw.html#id-1.11.7.47.12">F.38.2. Functions</a></span></dt><dt><span class="sect2"><a href="postgres-fdw.html#id-1.11.7.47.13">F.38.3. Connection Management</a></span></dt><dt><span class="sect2"><a href="postgres-fdw.html#id-1.11.7.47.14">F.38.4. Transaction Management</a></span></dt><dt><span class="sect2"><a href="postgres-fdw.html#id-1.11.7.47.15">F.38.5. Remote Query Optimization</a></span></dt><dt><span class="sect2"><a href="postgres-fdw.html#id-1.11.7.47.16">F.38.6. Remote Query Execution Environment</a></span></dt><dt><span class="sect2"><a href="postgres-fdw.html#id-1.11.7.47.17">F.38.7. Cross-Version Compatibility</a></span></dt><dt><span class="sect2"><a href="postgres-fdw.html#id-1.11.7.47.18">F.38.8. Configuration Parameters</a></span></dt><dt><span class="sect2"><a href="postgres-fdw.html#id-1.11.7.47.19">F.38.9. Examples</a></span></dt><dt><span class="sect2"><a href="postgres-fdw.html#id-1.11.7.47.20">F.38.10. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="seg.html">F.39. seg</a></span></dt><dd><dl><dt><span class="sect2"><a href="seg.html#id-1.11.7.48.5">F.39.1. Rationale</a></span></dt><dt><span class="sect2"><a href="seg.html#id-1.11.7.48.6">F.39.2. Syntax</a></span></dt><dt><span class="sect2"><a href="seg.html#id-1.11.7.48.7">F.39.3. Precision</a></span></dt><dt><span class="sect2"><a href="seg.html#id-1.11.7.48.8">F.39.4. Usage</a></span></dt><dt><span class="sect2"><a href="seg.html#id-1.11.7.48.9">F.39.5. Notes</a></span></dt><dt><span class="sect2"><a href="seg.html#id-1.11.7.48.10">F.39.6. Credits</a></span></dt></dl></dd><dt><span class="sect1"><a href="sepgsql.html">F.40. sepgsql</a></span></dt><dd><dl><dt><span class="sect2"><a href="sepgsql.html#SEPGSQL-OVERVIEW">F.40.1. Overview</a></span></dt><dt><span class="sect2"><a href="sepgsql.html#SEPGSQL-INSTALLATION">F.40.2. Installation</a></span></dt><dt><span class="sect2"><a href="sepgsql.html#SEPGSQL-REGRESSION">F.40.3. Regression Tests</a></span></dt><dt><span class="sect2"><a href="sepgsql.html#SEPGSQL-PARAMETERS">F.40.4. GUC Parameters</a></span></dt><dt><span class="sect2"><a href="sepgsql.html#SEPGSQL-FEATURES">F.40.5. Features</a></span></dt><dt><span class="sect2"><a href="sepgsql.html#SEPGSQL-FUNCTIONS">F.40.6. Sepgsql Functions</a></span></dt><dt><span class="sect2"><a href="sepgsql.html#SEPGSQL-LIMITATIONS">F.40.7. Limitations</a></span></dt><dt><span class="sect2"><a href="sepgsql.html#SEPGSQL-RESOURCES">F.40.8. External Resources</a></span></dt><dt><span class="sect2"><a href="sepgsql.html#SEPGSQL-AUTHOR">F.40.9. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="contrib-spi.html">F.41. spi</a></span></dt><dd><dl><dt><span class="sect2"><a href="contrib-spi.html#id-1.11.7.50.5">F.41.1. refint — Functions for Implementing Referential Integrity</a></span></dt><dt><span class="sect2"><a href="contrib-spi.html#id-1.11.7.50.6">F.41.2. autoinc — Functions for Autoincrementing Fields</a></span></dt><dt><span class="sect2"><a href="contrib-spi.html#id-1.11.7.50.7">F.41.3. insert_username — Functions for Tracking Who Changed a Table</a></span></dt><dt><span class="sect2"><a href="contrib-spi.html#id-1.11.7.50.8">F.41.4. moddatetime — Functions for Tracking Last Modification Time</a></span></dt></dl></dd><dt><span class="sect1"><a href="sslinfo.html">F.42. sslinfo</a></span></dt><dd><dl><dt><span class="sect2"><a href="sslinfo.html#id-1.11.7.51.6">F.42.1. Functions Provided</a></span></dt><dt><span class="sect2"><a href="sslinfo.html#id-1.11.7.51.7">F.42.2. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="tablefunc.html">F.43. tablefunc</a></span></dt><dd><dl><dt><span class="sect2"><a href="tablefunc.html#id-1.11.7.52.5">F.43.1. Functions Provided</a></span></dt><dt><span class="sect2"><a href="tablefunc.html#id-1.11.7.52.6">F.43.2. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="tcn.html">F.44. tcn</a></span></dt><dt><span class="sect1"><a href="test-decoding.html">F.45. test_decoding</a></span></dt><dt><span class="sect1"><a href="tsm-system-rows.html">F.46. tsm_system_rows</a></span></dt><dd><dl><dt><span class="sect2"><a href="tsm-system-rows.html#id-1.11.7.55.8">F.46.1. Examples</a></span></dt></dl></dd><dt><span class="sect1"><a href="tsm-system-time.html">F.47. tsm_system_time</a></span></dt><dd><dl><dt><span class="sect2"><a href="tsm-system-time.html#id-1.11.7.56.8">F.47.1. Examples</a></span></dt></dl></dd><dt><span class="sect1"><a href="unaccent.html">F.48. unaccent</a></span></dt><dd><dl><dt><span class="sect2"><a href="unaccent.html#id-1.11.7.57.6">F.48.1. Configuration</a></span></dt><dt><span class="sect2"><a href="unaccent.html#id-1.11.7.57.7">F.48.2. Usage</a></span></dt><dt><span class="sect2"><a href="unaccent.html#id-1.11.7.57.8">F.48.3. Functions</a></span></dt></dl></dd><dt><span class="sect1"><a href="uuid-ossp.html">F.49. uuid-ossp</a></span></dt><dd><dl><dt><span class="sect2"><a href="uuid-ossp.html#id-1.11.7.58.5">F.49.1. <code class="literal">uuid-ossp</code> Functions</a></span></dt><dt><span class="sect2"><a href="uuid-ossp.html#id-1.11.7.58.6">F.49.2. Building <code class="filename">uuid-ossp</code></a></span></dt><dt><span class="sect2"><a href="uuid-ossp.html#id-1.11.7.58.7">F.49.3. Author</a></span></dt></dl></dd><dt><span class="sect1"><a href="xml2.html">F.50. xml2</a></span></dt><dd><dl><dt><span class="sect2"><a href="xml2.html#id-1.11.7.59.4">F.50.1. Deprecation Notice</a></span></dt><dt><span class="sect2"><a href="xml2.html#id-1.11.7.59.5">F.50.2. Description of Functions</a></span></dt><dt><span class="sect2"><a href="xml2.html#id-1.11.7.59.6">F.50.3. <code class="literal">xpath_table</code></a></span></dt><dt><span class="sect2"><a href="xml2.html#id-1.11.7.59.7">F.50.4. XSLT Functions</a></span></dt><dt><span class="sect2"><a href="xml2.html#id-1.11.7.59.8">F.50.5. Author</a></span></dt></dl></dd></dl></div><p>
+  This appendix and the next one contain information regarding the modules that
+  can be found in the <code class="literal">contrib</code> directory of the
+  <span class="productname">PostgreSQL</span> distribution.
+  These include porting tools, analysis utilities,
+  and plug-in features that are not part of the core PostgreSQL system,
+  mainly because they address a limited audience or are too experimental
+  to be part of the main source tree.  This does not preclude their
+  usefulness.
+ </p><p>
+  This appendix covers extensions and other server plug-in modules found in
+  <code class="literal">contrib</code>.  <a class="xref" href="contrib-prog.html" title="Appendix G. Additional Supplied Programs">Appendix G</a> covers utility
+  programs.
+ </p><p>
+  When building from the source distribution, these components are not built
+  automatically, unless you build the "world" target
+  (see <a class="xref" href="install-procedure.html#BUILD" title="Build">Step 2</a>).
+  You can build and install all of them by running:
+</p><pre class="screen">
+<strong class="userinput"><code>make</code></strong>
+<strong class="userinput"><code>make install</code></strong>
+</pre><p>
+  in the <code class="literal">contrib</code> directory of a configured source tree;
+  or to build and install
+  just one selected module, do the same in that module's subdirectory.
+  Many of the modules have regression tests, which can be executed by
+  running:
+</p><pre class="screen">
+<strong class="userinput"><code>make check</code></strong>
+</pre><p>
+  before installation or
+</p><pre class="screen">
+<strong class="userinput"><code>make installcheck</code></strong>
+</pre><p>
+  once you have a <span class="productname">PostgreSQL</span> server running.
+ </p><p>
+  If you are using a pre-packaged version of <span class="productname">PostgreSQL</span>,
+  these modules are typically made available as a separate subpackage,
+  such as <code class="literal">postgresql-contrib</code>.
+ </p><p>
+  Many modules supply new user-defined functions, operators, or types.
+  To make use of one of these modules, after you have installed the code
+  you need to register the new SQL objects in the database system.
+  This is done by executing
+  a <a class="xref" href="sql-createextension.html" title="CREATE EXTENSION"><span class="refentrytitle">CREATE EXTENSION</span></a> command.  In a fresh database,
+  you can simply do
+
+</p><pre class="programlisting">
+CREATE EXTENSION <em class="replaceable"><code>module_name</code></em>;
+</pre><p>
+
+  This command registers the new SQL objects in the current database only,
+  so you need to run it in each database that you want
+  the module's facilities to be available in.  Alternatively, run it in
+  database <code class="literal">template1</code> so that the extension will be copied into
+  subsequently-created databases by default.
+ </p><p>
+  For all these modules, <code class="command">CREATE EXTENSION</code> must be run
+  by a database superuser, unless the module is
+  considered <span class="quote">“<span class="quote">trusted</span>”</span>, in which case it can be run by any
+  user who has <code class="literal">CREATE</code> privilege on the current
+  database.  Modules that are trusted are identified as such in the
+  sections that follow.  Generally, trusted modules are ones that cannot
+  provide access to outside-the-database functionality.
+ </p><p>
+  Many modules allow you to install their objects in a schema of your
+  choice.  To do that, add <code class="literal">SCHEMA
+  <em class="replaceable"><code>schema_name</code></em></code> to the <code class="command">CREATE EXTENSION</code>
+  command.  By default, the objects will be placed in your current creation
+  target schema, which in turn defaults to <code class="literal">public</code>.
+ </p><p>
+  Note, however, that some of these modules are not <span class="quote">“<span class="quote">extensions</span>”</span>
+  in this sense, but are loaded into the server in some other way, for instance
+  by way of
+  <a class="xref" href="runtime-config-client.html#GUC-SHARED-PRELOAD-LIBRARIES">shared_preload_libraries</a>.  See the documentation of each
+  module for details.
+ </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="release-prior.html" title="E.6. Prior Releases">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="appendixes.html" title="Part VIII. Appendixes">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="adminpack.html" title="F.1. adminpack">Next</a></td></tr><tr><td width="40%" align="left" valign="top">E.6. Prior Releases </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> F.1. adminpack</td></tr></table></div></body></html>
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