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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >DISCARD</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 9.2.24 Documentation" HREF="index.html"><LINK REL="UP" TITLE="SQL Commands" HREF="sql-commands.html"><LINK REL="PREVIOUS" TITLE="DELETE" HREF="sql-delete.html"><LINK REL="NEXT" TITLE="DO" HREF="sql-do.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2017-11-06T22:43:11"></HEAD ><BODY CLASS="REFENTRY" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" ><A HREF="index.html" >PostgreSQL 9.2.24 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="DELETE" HREF="sql-delete.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="sql-commands.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="DO" HREF="sql-do.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="SQL-DISCARD" ></A >DISCARD</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN73165" ></A ><H2 >Name</H2 >DISCARD -- discard session state</DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN73170" ></A ><H2 >Synopsis</H2 ><PRE CLASS="SYNOPSIS" >DISCARD { ALL | PLANS | TEMPORARY | TEMP }</PRE ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN73172" ></A ><H2 >Description</H2 ><P > <TT CLASS="COMMAND" >DISCARD</TT > releases internal resources associated with a database session. These resources are normally released at the end of the session. </P ><P > <TT CLASS="COMMAND" >DISCARD TEMP</TT > drops all temporary tables created in the current session. <TT CLASS="COMMAND" >DISCARD PLANS</TT > releases all internally cached query plans. <TT CLASS="COMMAND" >DISCARD ALL</TT > resets a session to its original state, discarding temporary resources and resetting session-local configuration changes. </P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN73180" ></A ><H2 >Parameters</H2 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><TT CLASS="LITERAL" >TEMPORARY</TT > or <TT CLASS="LITERAL" >TEMP</TT ></DT ><DD ><P > Drops all temporary tables created in the current session. </P ></DD ><DT ><TT CLASS="LITERAL" >PLANS</TT ></DT ><DD ><P > Releases all cached query plans. </P ></DD ><DT ><TT CLASS="LITERAL" >ALL</TT ></DT ><DD ><P > Releases all temporary resources associated with the current session and resets the session to its initial state. Currently, this has the same effect as executing the following sequence of statements: </P><PRE CLASS="PROGRAMLISTING" >SET SESSION AUTHORIZATION DEFAULT; RESET ALL; DEALLOCATE ALL; CLOSE ALL; UNLISTEN *; SELECT pg_advisory_unlock_all(); DISCARD PLANS; DISCARD TEMP;</PRE ><P></P ></DD ></DL ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN73200" ></A ><H2 >Notes</H2 ><P > <TT CLASS="COMMAND" >DISCARD ALL</TT > cannot be executed inside a transaction block. </P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN73204" ></A ><H2 >Compatibility</H2 ><P > <TT CLASS="COMMAND" >DISCARD</TT > is a <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > extension. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="sql-delete.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="sql-do.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >DELETE</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="sql-commands.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >DO</TD ></TR ></TABLE ></DIV ></BODY ></HTML >