Thread: "global/pgstat.stat" corrupt
Howdy, I just restored a DB from a cold backup (pg_ctl stop -m fast) When starting the DB I see: LOG: corrupted statistics file "global/pgstat.stat" When I look at the filesystem I don't see a global/pgstat.stat file but i do see a pg_stat_tmp/pgstat.stat is that PG rebuilding the corrupt file? Are those stats related to pg_stats style statistics? Any idea why that pgstats.stat file would be corrupt after a relativly clean backup like that?
David Kerr <dmk@mr-paradox.net> writes: > I just restored a DB from a cold backup (pg_ctl stop -m fast) > When starting the DB I see: > LOG: corrupted statistics file "global/pgstat.stat" Is that repeatable? It wouldn't be too surprising to see this once when starting from a filesystem backup, if you'd managed to capture a partially written stats file in the backup. > When I look at the filesystem I don't see a global/pgstat.stat file but i do see a > pg_stat_tmp/pgstat.stat This is normal --- global/pgstat.stat is only supposed to exist when the system is shut down. Transient updates are written into pg_stat_tmp/ > Are those stats related to pg_stats style statistics? No, this file is for the stats collection subsystem, http://www.postgresql.org/docs/9.1/static/monitoring-stats.html regards, tom lane
On Fri, Jun 22, 2012 at 03:49:00PM -0400, Tom Lane wrote: - David Kerr <dmk@mr-paradox.net> writes: - > I just restored a DB from a cold backup (pg_ctl stop -m fast) - - > When starting the DB I see: - > LOG: corrupted statistics file "global/pgstat.stat" - - Is that repeatable? It wouldn't be too surprising to see this once when - starting from a filesystem backup, if you'd managed to capture a - partially written stats file in the backup. hmm, possibly. it's somewhat worrysome if that file isn't written out what else isn't getting written out. our backups are SAN based snapshots, maybe i need to "sync" prior to the snapshot even with the DB being down. - > When I look at the filesystem I don't see a global/pgstat.stat file but i do see a - > pg_stat_tmp/pgstat.stat - - This is normal --- global/pgstat.stat is only supposed to exist when the - system is shut down. Transient updates are written into pg_stat_tmp/ ah ok - > Are those stats related to pg_stats style statistics? - - No, this file is for the stats collection subsystem, - http://www.postgresql.org/docs/9.1/static/monitoring-stats.html - - regards, tom lane - Oh, hmm thanks. I had looked at that before but must not have fully understood what was going on. That's interesting! Dave