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   2 <!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 38. Event Triggers</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="trigger-example.html" title="37.4. A Complete Trigger Example" /><link rel="next" href="event-trigger-definition.html" title="38.1. Overview of Event Trigger Behavior" /></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 38. Event Triggers</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="trigger-example.html" title="37.4. A Complete Trigger Example">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="server-programming.html" title="Part V. Server Programming">Up</a></td><th width="60%" align="center">Part V. Server Programming</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 18.0 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="event-trigger-definition.html" title="38.1. Overview of Event Trigger Behavior">Next</a></td></tr></table><hr /></div><div class="chapter" id="EVENT-TRIGGERS"><div class="titlepage"><div><div><h2 class="title">Chapter 38. Event Triggers</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="event-trigger-definition.html">38.1. Overview of Event Trigger Behavior</a></span></dt><dd><dl><dt><span class="sect2"><a href="event-trigger-definition.html#EVENT-TRIGGER-LOGIN">38.1.1. login</a></span></dt><dt><span class="sect2"><a href="event-trigger-definition.html#EVENT-TRIGGER-DDL_COMMAND_START">38.1.2. ddl_command_start</a></span></dt><dt><span class="sect2"><a href="event-trigger-definition.html#EVENT-TRIGGER-DDL_COMMAND_END">38.1.3. ddl_command_end</a></span></dt><dt><span class="sect2"><a href="event-trigger-definition.html#EVENT-TRIGGER-SQL_DROP">38.1.4. sql_drop</a></span></dt><dt><span class="sect2"><a href="event-trigger-definition.html#EVENT-TRIGGER-TABLE_REWRITE">38.1.5. table_rewrite</a></span></dt><dt><span class="sect2"><a href="event-trigger-definition.html#EVENT-TRIGGER-ABORTED-TRANSACTIONS">38.1.6. Event Triggers in Aborted Transactions</a></span></dt><dt><span class="sect2"><a href="event-trigger-definition.html#EVENT-TRIGGER-CREATING">38.1.7. Creating Event Triggers</a></span></dt></dl></dd><dt><span class="sect1"><a href="event-trigger-interface.html">38.2. Writing Event Trigger Functions in C</a></span></dt><dt><span class="sect1"><a href="event-trigger-example.html">38.3. A Complete Event Trigger Example</a></span></dt><dt><span class="sect1"><a href="event-trigger-table-rewrite-example.html">38.4. A Table Rewrite Event Trigger Example</a></span></dt><dt><span class="sect1"><a href="event-trigger-database-login-example.html">38.5. A Database Login Event Trigger Example</a></span></dt></dl></div><a id="id-1.8.5.2" class="indexterm"></a><p>
   3    To supplement the trigger mechanism discussed in <a class="xref" href="triggers.html" title="Chapter 37. Triggers">Chapter 37</a>,
   4    <span class="productname">PostgreSQL</span> also provides event triggers.  Unlike regular
   5    triggers, which are attached to a single table and capture only DML events,
   6    event triggers are global to a particular database and are capable of
   7    capturing DDL events.
   8   </p><p>
   9    Like regular triggers, event triggers can be written in any procedural
  10    language that includes event trigger support, or in C, but not in plain
  11    SQL.
  12   </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="trigger-example.html" title="37.4. A Complete Trigger Example">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="server-programming.html" title="Part V. Server Programming">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="event-trigger-definition.html" title="38.1. Overview of Event Trigger Behavior">Next</a></td></tr><tr><td width="40%" align="left" valign="top">37.4. A Complete Trigger Example </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 18.0 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 38.1. Overview of Event Trigger Behavior</td></tr></table></div></body></html>