rallel with index
   creation, but there are several caveats to be aware of &mdash;
   for more information see <A
HREF="sql-createindex.html#SQL-CREATEINDEX-CONCURRENTLY"
><I
>Building Indexes Concurrently</I
></A
>.
  </P
><P
>   After an index is created, the system has to keep it synchronized with the
   table.  This adds overhead to data manipulation operations.
   Therefore indexes that are seldom or never used in queries
   should be removed.
  </P
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