d updating session run-time parameters;  see <A
HREF="view-pg-settings.html"
>Section 47.66</A
> for details and a description of the
     different variable types and when they can be changed.
     <TT
CLASS="STRUCTNAME"
>pg_settings</TT
> is equivalent to <TT
CLASS="COMMAND"
>SHOW</TT
>
     and <TT
CLASS="COMMAND"
>SET</TT
>, but can be more convenient
     to use because it can be joined with other tables, or selected from using
     any desired selection condition. It also contains more information abo