On Monday 16 March 2009 17:55:00 Kostadin Solakov wrote: > John R Pierce wrote: > > thats odd, as a domain socket should be slightly -faster- than a tcp/ip > socket. now, since you say 'previous host' I could wonder if other > configuration items are impacting this, such as buffer sizes in > postgresql.conf, relative speed of disk controllers, etc. or perhaps > this new database hasn't been analyzed since it was populated, or its > indexes need rebuilding, or something similar... > > I think that is the issue. Previous server was old machine and the > settings in postgresql.conf were the default ones. > The new machine is Xeon quad with 8GB ram and I already made some > changes in postgresql.conf, but still no result. > I followed the instructions on > http://www.powerpostgresql.com/PerfList/ and made the following changes: > > shared_buffers = 50000 > work_mem = 512000 > checkpoint_segments = 32 > effective_cache_size = 200000 > > Also I ran REINDEX on the DB and VACUUM VERBOSE ANALYZE on each > table, but still the results are the same as before. > What are the settings you recommend for this server? > The application that is going to use it has a very demanding back > end, it parses very large XML files (20+) and saves the data in the DB. > Unless you're actually running 8.2, that information is a bit out of date. There's a better write up at http://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server Once you go through that and restart, if it's still slow, can you paste explain analyze from the two different servers? -- Robert Treat Conjecture: http://www.xzilla.net Consulting: http://www.omniti.com -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
