Excerpts from Justin Pasher's message of jue may 20 16:10:53 -0400 2010:
> Whenever I clear out the stats for all of the databases, the file
> shrinks down to <1MB. However, it only takes about a day for it to get
> back up to ~18MB and then the stats collector process start the heavy
> disk writing again. I do know there are some tables in the database that
> are filled and emptied quite a bit (they are used as temporary "queue"
> tables). The code will VACUUM FULL ANALYZE after the table is emptied to
> get the physical size back down and update the (empty) stats. A plain
> ANALYZE is also run right after the table is filled but before it starts
> processing, so the planner will have good stats on the contents of the
> table. Would this lead to pg_stat file bloat like I'm seeing? Would a
> CLUSTER then ANALYZE instead of a VACUUM FULL ANALYZE make any
> difference? The VACUUM FULL code was setup quite a while back before the
> coders knew about CLUSTER.
I wonder if we should make pgstats write one file per database (plus one
for shared objects), instead of keeping everything in a single file.
That would reduce the need for reading and writing so much.
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