Hi all, I'm wondering if there's an accepted way to monitor a warm standby machine's lag in 8.4. The wiki[1] has a link[2] to a script which parses the output of pg_controldata, looking for a line like this: Time of latest checkpoint: Thu 09 Dec 2010 01:35:46 PM EST But I'm not sure whether this timestamp is to be trusted as an indicator of how far behind the standby is in its recovery -- this timestamp just tells us when the standby last performed a checkpoint, regardless of how far behind in the WAL stream it is, right? I haven't come across any other monitoring suggestions for warm standby on 8.4. I've seen suggestions for hot standby slaves to use: SELECT pg_last_xlog_receive_location(); but this won't work on an 8.4 warm standby of course. I've searched around and haven't found[3] any other tips on how to monitor my standby. The manual mentions[4] using pg_xlogfile_name_offset() in the context of implementing record-based log shipping. Would this be useful for monitoring standby lag? Any other ideas? Thanks, Josh -- [1] http://wiki.postgresql.org/wiki/Warm_Standby [2] http://www.kennygorman.com/wordpress/?p=249 [3] I was hoping this page would have some relevant info: http://www.scottrmead.com/blogs/scott/warm-standby-monitoring , but it's down now :( [4] http://www.postgresql.org/docs/8.4/static/warm-standby.html#WARM-STANDBY-RECORD -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
