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Re: BUG #2263: corrupted pgstat.stat file

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "" <bug1(at)route66(dot)ro>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #2263: corrupted pgstat.stat file
Date: 2006-02-15 17:39:39
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-bugs
"" <bug1(at)route66(dot)ro> writes:
> I upgraded from 8.1.2 to 8.1.3 without dumping (was not required). After
> starting I got this error in the logs:

> LOG:  corrupted pgstat.stat file

> What should I do?

Ignore it.  We changed the format of the pgstat file between 8.1.2 and

2006-01-18 15:35  tgl

	* src/: backend/commands/vacuum.c, backend/postmaster/autovacuum.c,
	backend/postmaster/pgstat.c, backend/storage/smgr/smgr.c,
	include/pgstat.h (REL8_1_STABLE): Modify pgstats code to reduce
	performance penalties from oversized stats data files: avoid
	creating stats hashtable entries for tables that aren't being
	touched except by vacuum/analyze, ensure that entries for dropped
	tables are removed promptly, and tweak the data layout to avoid
	storing useless struct padding.  Also improve the performance of
	pgstat_vacuum_tabstat(), and make sure that autovacuum invokes it
	exactly once per autovac cycle rather than multiple times or not at
	all.  This should cure recent complaints about 8.1 showing much
	higher stats I/O volume than was seen in 8.0.  It'd still be a good
	idea to revisit the design with an eye to not re-writing the entire
	stats dataset every half second ... but that would be too much to
	backpatch, I fear.

			regards, tom lane

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