Chris <lists@xxxxxxxxxx> writes: > I have a lot of centos servers which are running postgres. Postgres isn't used > that heavily on any of them, but lately, the stats collector process keeps > causing tons of IO load. It seems to happen only on servers with centos 5. > The versions of postgres that are running are: > 8.1.18 > 8.2.6 > 8.3.1 > 8.3.5 > 8.3.6 > 8.3.7 > 8.3.8 > 8.3.9 > 8.4.2 > 8.4.3 Do these different server versions really all show the problem to the same extent? I'd expect 8.4.x in particular to be cheaper than the older branches. Are their pgstat.stat files all of similar sizes? (Note that 8.4.x keeps pgstat.stat under $PGDATA/pg_stat_tmp/ whereas in earlier versions it was under $PGDATA/global/.) If your applications create/use/drop a lot of tables (perhaps temp tables) then bloat of the pgstat.stat file is to be expected, but it should get cleaned up by vacuum (including autovacuum). What is your vacuuming policy on these servers ... do you use autovacuum? regards, tom lane -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
