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doc/src/sgml/ref/pgbench.sgml
@@ -473,6 +473,13 @@ pgbench <optional> <replaceable>options</replaceable> </optional> <replaceable>d
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<para><literal>prepared</literal>: use extended query protocol with prepared statements.</para>
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</listitem>
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</itemizedlist>
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+
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+ Because in "prepared" mode <application>pgbench</application> reuses
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+ the parse analysis result for the second and subsequent query
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+ iteration, <application>pgbench</application> runs faster in the
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+ prepared mode than in other modes.
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+ </para>
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+ <para>
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The default is simple query protocol. (See <xref linkend="protocol"/>
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for more information.)
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</para>
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