RONYM"
>SQL</ACRONYM
>
     sessions with the <A
HREF="sql-set.html"
>SET</A
>
     command, for example:
</P><PRE
CLASS="SCREEN"
>SET ENABLE_SEQSCAN TO OFF;</PRE
><P>
     If <TT
CLASS="COMMAND"
>SET</TT
> is allowed, it overrides all other sources of
     values for the parameter. Some parameters cannot be changed via
     <TT
CLASS="COMMAND"
>SET</TT
>: for example, if they control behavior that
     cannot be changed without restarting the entire
     <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> server