.  It is of use only when the primary dies &mdash;
    then the last partial WAL file is fed to the standby before allowing
    it to come up.  The correct implementation of this process requires
    cooperation of the <TT
CLASS="VARNAME"
>restore_command</TT
> script with the data
    copying program.
   </P
><P
>    Starting with <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> version 9.0, you can use
    streaming replication (see <A
HREF="warm-standby.html#STREAMING-REPLICATION"
>Section 25.2.5</A
>) to
 