On Sat, Sep 10, 2016 at 8:49 PM, Samir Magar <samirmag...@gmail.com> wrote:
> Hello, > > > My Application has normally 25 to 30 connections and it is doing lot of > insert/update/delete operation. > The database size is 100GB. > iowait is at 40% to 45 % and CPU idle time is at 45% to 50% > TOTAL RAM = 8 GB TOTAL CPU = 4 > > postgresql.conf parametre: > > shared_buffers = 2GB > work_mem = 100MB > effective_cache_size = 2GB > maintenance_work_mem = 500MB > autovacuum = off > wal_buffers = 64MB > > > How can i reduce iowait and CPU idle time. It is slowing all the queries. > The queries that used to take 1 sec,it is taking 12-15 seconds. > That does not point out the specific problem you are facing. Queries can slow down for a lot of reasons like as follows - - Lack of maintenance - Bloats in Tables and Indexes - Data size growth - If writes are slowing down, then it could be because of slow disks Are you saying that queries are slowing down when there are heavy writes ? Are you referring to SELECTs or all types of queries ? Regards, Venkata B N Fujitsu Australia
