<!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 9.0.15 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_shadow" HREF="view-pg-shadow.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="2014-01-24T13:16:52"></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" ><A HREF="index.html" >PostgreSQL 9.0.15 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="pg_rules" HREF="view-pg-rules.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="catalogs.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" >Chapter 45. System Catalogs</TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="pg_shadow" HREF="view-pg-shadow.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" >45.55. <TT CLASS="STRUCTNAME" >pg_settings</TT ></A ></H1 ><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 <A HREF="sql-show.html" >SHOW</A > and <A HREF="sql-set.html" >SET</A > 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="AEN83632" ></A ><P ><B >Table 45-56. <TT CLASS="STRUCTNAME" >pg_settings</TT > Columns</B ></P ><TABLE BORDER="1" CLASS="CALSTABLE" ><COL><COL><COL><THEAD ><TR ><TH >Name</TH ><TH >Type</TH ><TH >Description</TH ></TR ></THEAD ><TBODY ><TR ><TD ><TT CLASS="STRUCTFIELD" >name</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></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 >Current value of the parameter</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >unit</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD >Implicit unit of the parameter</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >category</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></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 >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 >Additional, more detailed, description of the parameter</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >context</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></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 >Parameter type (<TT CLASS="LITERAL" >bool</TT >, <TT CLASS="LITERAL" >enum</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 >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 >Minimum allowed value of the parameter (null for non-numeric values)</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >max_val</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD >Maximum allowed value of the parameter (null for non-numeric values)</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >enumvals</TT ></TD ><TD ><TT CLASS="TYPE" >text[]</TT ></TD ><TD >Allowed values of an enum parameter (null for non-enum values)</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >boot_val</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD >Parameter value assumed at server startup if the parameter is not otherwise set</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >reset_val</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD >Value that <TT CLASS="COMMAND" >RESET</TT > would reset the parameter to in the current session</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >sourcefile</TT ></TD ><TD ><TT CLASS="TYPE" >text</TT ></TD ><TD >Configuration file the current value was set in (null for values set from sources other than configuration files, or when examined by a non-superuser); helpful when using <TT CLASS="LITERAL" >include</TT > directives in configuration files</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >sourceline</TT ></TD ><TD ><TT CLASS="TYPE" >integer</TT ></TD ><TD >Line number within the configuration file the current value was set at (null for values set from sources other than configuration files, or when examined by a non-superuser) </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" >SET</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-shadow.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_shadow</TT ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >