Re: postgres 9.0.4 configuration and performance issue

thanks for the advice. One question I have is if I increase the
shared_buffers to 16GB, then it won't restart because for the 32 bit
version of postgres , we can't have shared buffers more than 3.2 GB right ?
( this from various blogs that I have read )

Thanks again for helping me out

On Fri, Oct 11, 2013 at 7:03 PM, Sergey Konoplev <gray(dot)ru(at)gmail(dot)com> wrote:

> On Fri, Oct 11, 2013 at 10:08 AM, akp geek <akpgeek(at)gmail(dot)com> wrote:
> > We have 4 applications ( 2 transactional , 2 ( transactional + reporting
> ))
> > on postgres 32 bit 9.0.4
> >
> > Some of the queries are extreemly taking time ( 10 seconds). I can the
> > explain for that also.
> >
> > I just want to get your thoughts on the conf file values we have are
> good.
> > Really appreciate your help.
>
> Start with the changes below. Later tuning will depend on further
> observations. I also recommend you to install pgbouncer, and configure
> it as transaction polling if you don't use prepared statements or as
> statement pooling if you don't use transactions either. I also suggest
> you to to perform VACUUM FULL or use
> https://github.com/reorg/pg_repack or
> https://github.com/grayhemp/pgtoolkit because your autovacuum was
> configured inappropriately and you might have a lot of bloat in your
> database.
>
> shared_buffers = 16GB
> temp_buffers = 16MB
> work_mem = 128MB
> maintenance_work_mem = 512GB
> vacuum_cost_delay = 5ms
> bgwriter_delay = 10ms
> bgwriter_lru_maxpages = 500
> bgwriter_lru_multiplier = 5.0
> effective_io_concurrency = 4 # put here a number of disks in your RAID
> checkpoint_segments = 128
> checkpoint_timeout = 1h
> checkpoint_completion_target = 0.9
> checkpoint_warning = 10min
> wal_keep_segments = 256
> seq_page_cost = 1.0
> random_page_cost = 2.0 # put 1.0 if you have SSD , 2.0 in other cases
> effective_cache_size = 56GB
> track_activity_query_size = 4096
> log_autovacuum_min_duration = 1000
> autovacuum_max_workers = 5
> autovacuum_naptime = 5s
> autovacuum_vacuum_scale_factor = 0.05
> autovacuum_analyze_scale_factor = 0.05
> autovacuum_vacuum_cost_delay = 5ms
>
> --
> Kind regards,
> Sergey Konoplev
> PostgreSQL Consultant and DBA
>
> http://www.linkedin.com/in/grayhemp
> +1 (415) 867-9984, +7 (901) 903-0499, +7 (988) 888-1979
> gray(dot)ru(at)gmail(dot)com
>