Sophie: postgresql8.2-docs-8.2.14-1mdv2010.0 i586

postgresql8.2-docs-8.2.14-1mdv2010.0.i586.rpm

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><A
NAME="CATALOG-PG-OPCLASS"
>43.24. <TT
CLASS="STRUCTNAME"
>pg_opclass</TT
></A
></H1
><A
NAME="AEN64055"
></A
><P
>   The catalog <TT
CLASS="STRUCTNAME"
>pg_opclass</TT
> defines
   index access method operator classes.  Each operator class defines
   semantics for index columns of a particular data type and a particular
   index access method.  Note that there can be multiple operator classes
   for a given data type/access method combination, thus supporting multiple
   behaviors.
  </P
><P
>   Operator classes are described at length in <A
HREF="xindex.html"
>Section 33.14</A
>.
  </P
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><P
><B
>Table 43-24. <TT
CLASS="STRUCTNAME"
>pg_opclass</TT
> Columns</B
></P
><TABLE
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><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"
>opcamid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-am.html"
><TT
CLASS="STRUCTNAME"
>pg_am</TT
></A
>.oid</TT
></TD
><TD
>Index access method operator class is for</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>opcname</TT
></TD
><TD
><TT
CLASS="TYPE"
>name</TT
></TD
><TD
>&nbsp;</TD
><TD
>Name of this operator class</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>opcnamespace</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-namespace.html"
><TT
CLASS="STRUCTNAME"
>pg_namespace</TT
></A
>.oid</TT
></TD
><TD
>Namespace of this operator class</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>opcowner</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-authid.html"
><TT
CLASS="STRUCTNAME"
>pg_authid</TT
></A
>.oid</TT
></TD
><TD
>Owner of the operator class</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>opcintype</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
>Data type that the operator class indexes</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>opcdefault</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
>&nbsp;</TD
><TD
>True if this operator class is the default for <TT
CLASS="STRUCTFIELD"
>opcintype</TT
></TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>opckeytype</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
>Type of data stored in index, or zero if same as <TT
CLASS="STRUCTFIELD"
>opcintype</TT
></TD
></TR
></TBODY
></TABLE
></DIV
><P
>   The majority of the information defining an operator class is actually
   not in its <TT
CLASS="STRUCTNAME"
>pg_opclass</TT
> row, but in the associated
   rows in <TT
CLASS="STRUCTNAME"
>pg_amop</TT
> and
   <TT
CLASS="STRUCTNAME"
>pg_amproc</TT
>.  Those rows are considered to be
   part of the operator class definition &mdash; this is not unlike the way
   that a relation is defined by a single <TT
CLASS="STRUCTNAME"
>pg_class</TT
>
   row plus associated rows in <TT
CLASS="STRUCTNAME"
>pg_attribute</TT
> and
   other tables.
  </P
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