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><H1
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><A
NAME="CATALOG-PG-INDEX"
>45.25. <TT
CLASS="STRUCTNAME"
>pg_index</TT
></A
></H1
><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
CLASS="TABLE"
><A
NAME="AEN91087"
></A
><P
><B
>Table 45-25. <TT
CLASS="STRUCTNAME"
>pg_index</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"
>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"
>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"
>indisexclusion</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
> </TD
><TD
>If true, this index supports an exclusion constraint</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>indimmediate</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
> </TD
><TD
>If true, the uniqueness check is enforced immediately on
insertion
(irrelevant if <TT
CLASS="STRUCTFIELD"
>indisunique</TT
> is not 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"
>indisvalid</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
> </TD
><TD
> If both this flag and <TT
CLASS="STRUCTFIELD"
>indisready</TT
> are
true, the index is currently valid for queries. False means the
index is possibly incomplete: it must still be modified by
<TT
CLASS="COMMAND"
>INSERT</TT
>/<TT
CLASS="COMMAND"
>UPDATE</TT
> operations, but it cannot safely
be used for queries. If it is unique, the uniqueness property is not
guaranteed true either.
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>indcheckxmin</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
> </TD
><TD
> If true, queries must not use the index until the <TT
CLASS="STRUCTFIELD"
>xmin</TT
>
of this <TT
CLASS="STRUCTNAME"
>pg_index</TT
> row is below their <TT
CLASS="SYMBOL"
>TransactionXmin</TT
>
event horizon, because the table may contain broken HOT chains with
incompatible rows that they can see
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>indisready</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
> </TD
><TD
> If true, the index is currently ready for inserts. False means the
index must be ignored by <TT
CLASS="COMMAND"
>INSERT</TT
>/<TT
CLASS="COMMAND"
>UPDATE</TT
>
operations.
</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
> 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"
>indcollation</TT
></TD
><TD
><TT
CLASS="TYPE"
>oidvector</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-collation.html"
><TT
CLASS="STRUCTNAME"
>pg_collation</TT
></A
>.oid</TT
></TD
><TD
> For each column in the index key, this contains the OID of the
collation to use for the index.
</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
<A
HREF="catalog-pg-opclass.html"
><TT
CLASS="STRUCTNAME"
>pg_opclass</TT
></A
> for details.
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>indoption</TT
></TD
><TD
><TT
CLASS="TYPE"
>int2vector</TT
></TD
><TD
> </TD
><TD
> This is an array of <TT
CLASS="STRUCTFIELD"
>indnatts</TT
> values that
store per-column flag bits. The meaning of the bits is defined by
the index's access method.
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>indexprs</TT
></TD
><TD
><TT
CLASS="TYPE"
>pg_node_tree</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"
>pg_node_tree</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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