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>PostgreSQL 8.0.11 Documentation</TH
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>Chapter 41. System Catalogs</TD
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><H1
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><A
NAME="CATALOG-PG-INDEX"
>41.16. <TT
CLASS="STRUCTNAME"
>pg_index</TT
></A
></H1
><A
NAME="AEN53508"
></A
><P
> The catalog <TT
CLASS="STRUCTNAME"
>pg_index</TT
> contains part of the information
about indexes. The rest is mostly in
<TT
CLASS="STRUCTNAME"
>pg_class</TT
>.
</P
><DIV
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><P
><B
>Table 41-16. <TT
CLASS="STRUCTNAME"
>pg_index</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"
>indexrelid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-class.html"
><TT
CLASS="STRUCTNAME"
>pg_class</TT
></A
>.oid</TT
></TD
><TD
>The OID of the <TT
CLASS="STRUCTNAME"
>pg_class</TT
> entry for this index</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>indrelid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-class.html"
><TT
CLASS="STRUCTNAME"
>pg_class</TT
></A
>.oid</TT
></TD
><TD
>The OID of the <TT
CLASS="STRUCTNAME"
>pg_class</TT
> entry for the table this index is for</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>indkey</TT
></TD
><TD
><TT
CLASS="TYPE"
>int2vector</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-attribute.html"
><TT
CLASS="STRUCTNAME"
>pg_attribute</TT
></A
>.attnum</TT
></TD
><TD
> This is an array of <TT
CLASS="STRUCTFIELD"
>indnatts</TT
> (up to
<TT
CLASS="SYMBOL"
>INDEX_MAX_KEYS</TT
>) values that indicate which
table columns this index indexes. For example a value of
<TT
CLASS="LITERAL"
>1 3</TT
> would mean that the first and the third table
columns make up the index key. A zero in this array indicates that the
corresponding index attribute is an expression over the table columns,
rather than a simple column reference.
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>indclass</TT
></TD
><TD
><TT
CLASS="TYPE"
>oidvector</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-opclass.html"
><TT
CLASS="STRUCTNAME"
>pg_opclass</TT
></A
>.oid</TT
></TD
><TD
> For each column in the index key this contains the OID of
the operator class to use. See
<TT
CLASS="STRUCTNAME"
>pg_opclass</TT
> for details.
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>indnatts</TT
></TD
><TD
><TT
CLASS="TYPE"
>int2</TT
></TD
><TD
> </TD
><TD
>The number of columns in the index (duplicates
<TT
CLASS="LITERAL"
>pg_class.relnatts</TT
>)</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>indisunique</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
> </TD
><TD
>If true, this is a unique index.</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>indisprimary</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
> </TD
><TD
>If true, this index represents the primary key of the table.
(<TT
CLASS="STRUCTFIELD"
>indisunique</TT
> should always be true when this is true.)</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>indisclustered</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
> </TD
><TD
>If true, the table was last clustered on this index.</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>indexprs</TT
></TD
><TD
><TT
CLASS="TYPE"
>text</TT
></TD
><TD
> </TD
><TD
>Expression trees (in <CODE
CLASS="FUNCTION"
>nodeToString()</CODE
> representation)
for index attributes that are not simple column references. This is a
list with one element for each zero entry in <TT
CLASS="STRUCTFIELD"
>indkey</TT
>.
Null if all index attributes are simple references.</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>indpred</TT
></TD
><TD
><TT
CLASS="TYPE"
>text</TT
></TD
><TD
> </TD
><TD
>Expression tree (in <CODE
CLASS="FUNCTION"
>nodeToString()</CODE
> representation)
for partial index predicate. Null if not a partial index.</TD
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