<row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>indcheckxmin</structfield> <type>bool</type>
      </para>
      <para>
       If true, queries must not use the index until the <structfield>xmin</structfield>
       of this <structname>pg_index</structname> row is below their <symbol>TransactionXmin</symbol>
       event horizon, because the table may contain broken <link linkend="storage-hot">HOT chains</link> with
       incompatible rows that they can see
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>indisready</structfield> <type>bool</type>
      </para>
      <para>
       If true, the index is currently ready for inserts.  False means the
       index must be ignored by <link linkend="sql-insert"><command>INSERT</command></link>/<link linkend="sql-update"><command>UPDATE</command></link>
       operations.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>indislive</structfield> <type>bool</type>
      </para>
      <para>
       If false, the index is in process of being dropped, and should be
       ignored for all purposes (including HOT-safety decisions)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>indisreplident</structfield> <type>bool</type>
      </para>
      <para>
       If true this index has been chosen as <quote>replica identity</quote>
       using <link linkend="sql-altertable-replica-identity"><command>ALTER TABLE ...
       REPLICA IDENTITY USING INDEX ...</command></link>
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>indkey</structfield> <type>int2vector</type>
       (references <link linkend="catalog-pg-attribute"><structname>pg_attribute</structname></link>.<structfield>attnum</structfield>)
      </para>
      <para>
       This is an array of <structfield>indnatts</structfield> values that
       indicate which table columns this index indexes.  For example, a value
       of <literal>1 3</literal> would mean that the first and the third table
       columns make up the index entries.  Key columns come before non-key
       (included) columns.  A zero in this array indicates that the
       corresponding index attribute is an expression over the table columns,
       rather than a simple column reference.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>indcollation</structfield> <type>oidvector</type>
       (references <link linkend="catalog-pg-collation"><structname>pg_collation</structname></link>.<structfield>oid</structfield>)
      </para>
      <para>
       For each column in the index key
       (<structfield>indnkeyatts</structfield> values), this contains the OID
       of the collation to use for the index, or zero if the column is not of
       a collatable data type.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>indclass</structfield> <type>oidvector</type>
       (references <link linkend="catalog-pg-opclass"><structname>pg_opclass</structname></link>.<structfield>oid</structfield>)
      </para>
      <para>
       For each column in the index key
       (<structfield>indnkeyatts</structfield> values), this contains the OID
       of the operator class to use.  See
       <link linkend="catalog-pg-opclass"><structname>pg_opclass</structname></link> for details.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>indoption</structfield> <type>int2vector</type>
      </para>
      <para>
       This is an array of