<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >pg_amproc</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 8.4.12 Documentation" HREF="index.html"><LINK REL="UP" TITLE="System Catalogs" HREF="catalogs.html"><LINK REL="PREVIOUS" TITLE="pg_amop" HREF="catalog-pg-amop.html"><LINK REL="NEXT" TITLE="pg_attrdef" HREF="catalog-pg-attrdef.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="2012-05-31T23:30:11"></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 8.4.12 Documentation</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="catalog-pg-amop.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 44. 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="catalog-pg-attrdef.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="CATALOG-PG-AMPROC" >44.5. <TT CLASS="STRUCTNAME" >pg_amproc</TT ></A ></H1 ><A NAME="AEN74413" ></A ><P > The catalog <TT CLASS="STRUCTNAME" >pg_amproc</TT > stores information about support procedures associated with access method operator families. There is one row for each support procedure belonging to an operator family. </P ><DIV CLASS="TABLE" ><A NAME="AEN74417" ></A ><P ><B >Table 44-5. <TT CLASS="STRUCTNAME" >pg_amproc</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" >amprocfamily</TT ></TD ><TD ><TT CLASS="TYPE" >oid</TT ></TD ><TD ><TT CLASS="LITERAL" ><A HREF="catalog-pg-opfamily.html" ><TT CLASS="STRUCTNAME" >pg_opfamily</TT ></A >.oid</TT ></TD ><TD >The operator family this entry is for</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >amproclefttype</TT ></TD ><TD ><TT CLASS="TYPE" >oid</TT ></TD ><TD ><TT CLASS="LITERAL" ><A HREF="catalog-pg-type.html" ><TT CLASS="STRUCTNAME" >pg_type</TT ></A >.oid</TT ></TD ><TD >Left-hand input data type of associated operator</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >amprocrighttype</TT ></TD ><TD ><TT CLASS="TYPE" >oid</TT ></TD ><TD ><TT CLASS="LITERAL" ><A HREF="catalog-pg-type.html" ><TT CLASS="STRUCTNAME" >pg_type</TT ></A >.oid</TT ></TD ><TD >Right-hand input data type of associated operator</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >amprocnum</TT ></TD ><TD ><TT CLASS="TYPE" >int2</TT ></TD ><TD > </TD ><TD >Support procedure number</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >amproc</TT ></TD ><TD ><TT CLASS="TYPE" >regproc</TT ></TD ><TD ><TT CLASS="LITERAL" ><A HREF="catalog-pg-proc.html" ><TT CLASS="STRUCTNAME" >pg_proc</TT ></A >.oid</TT ></TD ><TD >OID of the procedure</TD ></TR ></TBODY ></TABLE ></DIV ><P > The usual interpretation of the <TT CLASS="STRUCTFIELD" >amproclefttype</TT > and <TT CLASS="STRUCTFIELD" >amprocrighttype</TT > fields is that they identify the left and right input types of the operator(s) that a particular support procedure supports. For some access methods these match the input data type(s) of the support procedure itself, for others not. There is a notion of <SPAN CLASS="QUOTE" >"default"</SPAN > support procedures for an index, which are those with <TT CLASS="STRUCTFIELD" >amproclefttype</TT > and <TT CLASS="STRUCTFIELD" >amprocrighttype</TT > both equal to the index opclass's <TT CLASS="STRUCTFIELD" >opcintype</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="catalog-pg-amop.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="catalog-pg-attrdef.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><TT CLASS="STRUCTNAME" >pg_amop</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_attrdef</TT ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >