Hello Venkata,
Thank you for the reply!
I forgot to specify the application name.It is ZABBIX tool using postgreSQL database. All types of queries are running slow and i can see application is writing continuously.
Yesterday , i updated effective_io_concurrency to 25 which earlier set as default. But this has not helped me to solve the problem.
Yes, you are right, the database size has grown from 5 GB database to 100 GB database and may be there is problem in slownesss in disk. However we cannot replace the disk right now.
I ran vacuum and analyze manually on all the tables as well. Still it is not helping. Can you think of any other setting which i should enable?
Thanks,
Samir Magar
On Sun, Sep 11, 2016 at 6:04 AM, Venkata B Nagothi <nag1010@xxxxxxxxx> wrote:
On Sat, Sep 10, 2016 at 8:49 PM, Samir Magar <samirmagar8@xxxxxxxxx> 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 = 4postgresql.conf parametre:shared_buffers = 2GBwork_mem = 100MBeffective_cache_size = 2GBmaintenance_work_mem = 500MBautovacuum = offwal_buffers = 64MBHow 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 disksAre 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 NFujitsu Australia