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>21.4. Database Configuration</A
></H1
><P
> Recall from <A
HREF="runtime-config.html"
>Chapter 18</A
> that the
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> server provides a large number of
run-time configuration variables. You can set database-specific
default values for many of these settings.
</P
><P
> For example, if for some reason you want to disable the
<ACRONYM
CLASS="ACRONYM"
>GEQO</ACRONYM
> optimizer for a given database, you'd
ordinarily have to either disable it for all databases or make sure
that every connecting client is careful to issue <TT
CLASS="LITERAL"
>SET geqo
TO off</TT
>. To make this setting the default within a particular
database, you can execute the command:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER DATABASE mydb SET geqo TO off;</PRE
><P>
This will save the setting (but not set it immediately). In
subsequent connections to this database it will appear as though
<TT
CLASS="LITERAL"
>SET geqo TO off;</TT
> had been executed just before the
session started.
Note that users can still alter this setting during their sessions; it
will only be the default. To undo any such setting, use
<TT
CLASS="LITERAL"
>ALTER DATABASE <TT
CLASS="REPLACEABLE"
><I
>dbname</I
></TT
> RESET
<TT
CLASS="REPLACEABLE"
><I
>varname</I
></TT
></TT
>.
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