index e81141e45cf7a6f7bd66651f2199eb06dbe00ba9..d7a73767984eb84831f9d2695a754e2a02be57c8 100644 (file)
@@ -4503,15 +4503,16 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class="
view. The standby will report
the last write-ahead log location it has written, the last position it
has flushed to disk, and the last position it has applied.
- This parameter's
- value is the maximum amount of time between reports. Updates are
- sent each time the write or flush positions change, or at least as
- often as specified by this parameter. Thus, the apply position may
- lag slightly behind the true position.
+ This parameter's value is the maximum amount of time between reports.
+ Updates are sent each time the write or flush positions change, or as
+ often as specified by this parameter if set to a non-zero value.
+ There are additional cases where updates are sent while ignoring this
+ parameter; for example, when processing of the existing WAL completes
+ or when <varname>synchronous_commit</varname> is set to
+ <literal>remote_apply</literal>.
+ Thus, the apply position may lag slightly behind the true position.
If this value is specified without units, it is taken as seconds.
- The default value is 10 seconds.
- Setting this parameter to zero disables status updates completely.
- This parameter can only be set in
+ The default value is 10 seconds. This parameter can only be set in
the <filename>postgresql.conf</filename> file or on the server
command line.
</para>