to implement table partitioning.
        Turning it on for all tables imposes extra planning overhead that is
        quite noticeable on simple queries, and most often will yield no
        benefit for simple queries.  If you have no partitioned tables
        you might prefer to turn it off entirely.
       </P
><P
>        Refer to <A
HREF="ddl-partitioning.html#DDL-PARTITIONING-CONSTRAINT-EXCLUSION"
>Section 5.9.4</A
> for
        more information on using constraint exclusion and partitioning.
       <