Explicitely mention that some GUC variables cannot be changed at
runtime.
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<!--
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<!--
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$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.244 2004/03/05 23:16:17 tgl Exp $
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$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.245 2004/03/07 01:02:55 neilc Exp $
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-->
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-->
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<Chapter Id="runtime">
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<Chapter Id="runtime">
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@ -541,8 +541,11 @@ env PGOPTIONS='-c geqo=off' psql
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SET ENABLE_SEQSCAN TO OFF;
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SET ENABLE_SEQSCAN TO OFF;
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</screen>
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</screen>
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If <command>SET</> is allowed, it overrides all other sources of
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If <command>SET</> is allowed, it overrides all other sources of
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values for the parameter. Superusers are allowed to <command>SET</>
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values for the parameter. Superusers are allowed to
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more values than ordinary users.
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<command>SET</> more values than ordinary users. Some parameters
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cannot be <command>SET</command> even by superusers: for example,
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if they control behavior that cannot reasonably be changed without
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restarting <productname>PostgreSQL</productname>.
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</para>
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</para>
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<para>
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<para>
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