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Update comment about outer joins in description of geqo_threshold.
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doc/src/sgml/config.sgml

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<!--
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$PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.42 2006/01/05 10:07:44 petere Exp $
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$PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.43 2006/01/11 23:14:29 tgl Exp $
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-->
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<chapter Id="runtime-config">
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<title>Server Configuration</title>
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<listitem>
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<para>
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Use genetic query optimization to plan queries with at least
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this many <literal>FROM</> items involved. (Note that an outer
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<literal>JOIN</> construct counts as only one <literal>FROM</>
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this many <literal>FROM</> items involved. (Note that a
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<literal>FULL OUTER JOIN</> construct counts as only one <literal>FROM</>
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item.) The default is 12. For simpler queries it is usually best
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to use the deterministic, exhaustive planner, but for queries with
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many tables the deterministic planner takes too long.

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