<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >pg_settings</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 8.0.11 Documentation" HREF="index.html"><LINK REL="UP" TITLE="System Catalogs" HREF="catalogs.html"><LINK REL="PREVIOUS" TITLE="pg_rules" HREF="view-pg-rules.html"><LINK REL="NEXT" TITLE="pg_stats" HREF="view-pg-stats.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="2007-02-02T03:57:22"></HEAD ><BODY CLASS="SECT1" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" >PostgreSQL 8.0.11 Documentation</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="view-pg-rules.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="catalogs.html" >Fast Backward</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" >Chapter 41. System Catalogs</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="top" ><A HREF="catalogs.html" >Fast Forward</A ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="top" ><A HREF="view-pg-stats.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="VIEW-PG-SETTINGS" >41.35. <TT CLASS="STRUCTNAME" >pg_settings</TT ></A ></H1 ><A NAME="AEN55366" ></A ><P > The view <TT CLASS="STRUCTNAME" >pg_settings</TT > provides access to run-time parameters of the server. It is essentially an alternative interface to the <TT CLASS="COMMAND" >SHOW</TT > and <TT CLASS="COMMAND" >SET</TT > commands. It also provides access to some facts about each parameter that are not directly available from <TT CLASS="COMMAND" >SHOW</TT >, such as minimum and maximum values. </P ><DIV CLASS="TABLE" ><A NAME="AEN55373" ></A ><P ><B >Table 41-35. <TT CLASS="STRUCTNAME" >pg_settings</TT > Columns</B ></P ><TABLE BORDER="1" CLASS="CALSTABLE" ><COL><COL><COL><COL><THEAD ><TR ><TH >Name</TH ><TH >Type</TH ><TH >References</TH ><TH >Description</TH ></TR ></THEAD ><TBODY ><TR ><TD ><TT CLASS="STRUCTFIELD" >name</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD > </TD ><TD >run-time configuration parameter name</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >setting</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD > </TD ><TD >current value of the parameter</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >category</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD > </TD ><TD >logical group of the parameter</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >short_desc</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD > </TD ><TD >a brief description of the parameter</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >extra_desc</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD > </TD ><TD >additional, more detailed, information about the parameter</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >context</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD > </TD ><TD >context required to set the parameter's value</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >vartype</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD > </TD ><TD >parameter type (<TT CLASS="LITERAL" >bool</TT >, <TT CLASS="LITERAL" >integer</TT >, <TT CLASS="LITERAL" >real</TT >, or <TT CLASS="LITERAL" >string</TT >) </TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >source</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD > </TD ><TD >source of the current parameter value</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >min_val</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD > </TD ><TD >minimum allowed value of the parameter (NULL for nonnumeric values)</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >max_val</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD > </TD ><TD >maximum allowed value of the parameter (NULL for nonnumeric values)</TD ></TR ></TBODY ></TABLE ></DIV ><P > The <TT CLASS="STRUCTNAME" >pg_settings</TT > view cannot be inserted into or deleted from, but it can be updated. An <TT CLASS="COMMAND" >UPDATE</TT > applied to a row of <TT CLASS="STRUCTNAME" >pg_settings</TT > is equivalent to executing the <A HREF="sql-set.html" ><I >SET</I ></A > command on that named parameter. The change only affects the value used by the current session. If an <TT CLASS="COMMAND" >UPDATE</TT > is issued within a transaction that is later aborted, the effects of the <TT CLASS="COMMAND" >UPDATE</TT > command disappear when the transaction is rolled back. Once the surrounding transaction is committed, the effects will persist until the end of the session, unless overridden by another <TT CLASS="COMMAND" >UPDATE</TT > or <TT CLASS="COMMAND" >SET</TT >. </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="view-pg-rules.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="view-pg-stats.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><TT CLASS="STRUCTNAME" >pg_rules</TT ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="catalogs.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><TT CLASS="STRUCTNAME" >pg_stats</TT ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >