Have you set checkpoint_segments and checkpoint_completion_target the right way?
Tuning these parameters are a MUST if you want good write performance.
See this link for more information: http://www.postgresql.org/docs/current/static/runtime-config-wal.html
Cheers,
Dusan
On Thu, Aug 4, 2011 at 6:56 AM, Adarsh Sharma <adarsh.sharma@xxxxxxxxxx> wrote:
Dear all,
>From the last few days, I researched a lot on Postgresql Performance Tuning due to slow speed of my server.
My application selects data from mysql database about 100000 rows , process it & insert into postgres 2 tables by making about 45 connections.
I set my postgresql parameters in postgresql.conf as below: ( OS : Ubuntu, RAM : 16 GB, Postgres : 8.4.2 )
max_connections = 80
shared_buffers = 2048MB
work_mem = 32MB
maintenance_work_mem = 512MB
fsync=off full_page_writes=off synchronous_commit=off checkpoint_segments = 32
checkpoint_completion_target = 0.7 effective_cache_size = 4096MB
After this I change my pg_xlog directory to a separate directory other than data directory by symlinking.
By Application issue insert statements through postgresql connections only.
Please let me know if I missing any other important configuration.
Thanks
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