 end of WAL through the current end
    over to the standby servers.  With this approach, the window for data
    loss is the polling cycle time of the copying program, which can be very
    small, and there is no wasted bandwidth from forcing partially-used
    segment files to be archived.  Note that the standby servers'
    <TT
CLASS="VARNAME"
>restore_command</TT
> scripts can only deal with whole WAL files,
    so the incrementally copied data is not ordinarily made available to
    the standby servers