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<Chapter Id="runtime">

SET ENABLE_SEQSCAN TO OFF;

</screen>

If <command>SET</> is allowed, it overrides all other sources of

values for the parameter. Superusers are allowed to

<command>SET</> more values than ordinary users. Some parameters

cannot be <command>SET</command> even by superusers: for example,

if they control behavior that cannot reasonably be changed without

restarting <productname>PostgreSQL</productname>.

values for the parameter. Some parameters cannot be changed via

<command>SET</command>: for example, if they control behavior that

cannot reasonably be changed without restarting

<productname>PostgreSQL</productname>. Also, some parameters can

be modified via <command>SET</command> by superusers, but not by

ordinary users.

</para>

<para>