Ed L. wrote: > Well, I think we clearly have an HPUX CPU bottleneck (long pri > queue, high cpu utilization, high user cpu %, lots of processes > "blocked on pri"). > > It seems to get worst and slow all queries down across the board > when autovac tries to vacuum a 15GB table. I'm guessing this is > flushing the OS/DB caches, exacerbating the CPU bottleneck. > > I'm also not sure what to do about it beyond the customer buying > some politically/financially expensive CPUs. I suggest turning autovac off for that particular table, and doing the vacuum during off-peak hours. > The table in > question appears to be the pathological case for vacuum: very > large with lots of frequent UPDATEs. It's essentially a log > table. A big log table where the log entries are being updated? Certainly sounds like a recipe for vacuum headaches. -- Alvaro Herrera http://www.CommandPrompt.com/ PostgreSQL Replication, Consulting, Custom Development, 24x7 support
