cing <TT
CLASS="STRUCTNAME"
>pg_settings</TT
>.<TT
CLASS="STRUCTFIELD"
>unit</TT
>.
     For convenience,
     a different unit can also be specified explicitly.  Valid memory units
     are <TT
CLASS="LITERAL"
>kB</TT
> (kilobytes), <TT
CLASS="LITERAL"
>MB</TT
>
     (megabytes), and <TT
CLASS="LITERAL"
>GB</TT
> (gigabytes); valid time units
     are <TT
CLASS="LITERAL"
>ms</TT
> (milliseconds), <TT
CLASS="LITERAL"
>s</TT
>
     (seconds), <TT
CLASS="LITERAL"
>min</TT
> (minutes), <TT
CLASS="LITERAL"
>h</