[PERFORM] waiting for harddisk
i am using postgresql 8.1.8, Following configurations: shared_buffers = 5000 work_mem = 65536 maintenance_work_mem = 65536 effective_cache_size = 16000 random_page_cost = 0.1 The cpu is waiting percentage goes upto 50%, and query result comes later, i am using normal select query ( select * from table_name ). table has more then 6 million records. -- With Best Regards, Petchimuthulingam S
Re: [PERFORM] waiting for harddisk
i am using postgresql 8.1.8, Following configurations: shared_buffers = 5000 work_mem = 65536 maintenance_work_mem = 65536 effective_cache_size = 16000 random_page_cost = 0.1 The cpu is waiting percentage goes upto 50%, and query result comes later, i am using normal select query ( select * from table_name ). table has more then 6 million records. When you mean SELECT *, are you selecting the WHOLE 6 million records ? Without WHERE ? Or just a few rows ? Please post EXPLAIN ANALYZE of your query. - Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
Re: [PERFORM] waiting for harddisk
On Mon, Mar 24, 2008 at 7:05 AM, petchimuthu lingam [EMAIL PROTECTED] wrote: i am using postgresql 8.1.8, Following configurations: shared_buffers = 5000 work_mem = 65536 maintenance_work_mem = 65536 effective_cache_size = 16000 random_page_cost = 0.1 That number, 0.1 is not logical. anything below 1.0 is generally a bad idea, and means that you've got some other setting wrong. The cpu is waiting percentage goes upto 50%, and query result comes later, i am using normal select query ( select * from table_name ). table has more then 6 million records. You need faster disks if you want sequential scans to go faster. Look into a decent RAID controller (Areca, Escalade (forgot what they're called now) or LSI) with battery backed cache. Run RAID-10 on it with as many drives as you can afford to throw at the problem. -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
