Re: : PG9.0 - Checkpoint tuning and pg_stat_bgwriter

On 04.10.2011 13:50, Venkat Balaji wrote:
> I have got a situation where in i see the production system is loaded with
> the checkpoints and at-least 1000+ buffers are being written for every
> checkpoint.

1000 buffers isn't very much, that's only 8 MB, so that's not alarming
itself.

> I am thinking of increasing the checkpoint_segments.
>
> Below are our current settings -
>
> checkpoint_segments = 8
> checkpoint_timeout = 5 mins
> checkpoint_completion_target = 0.5
> bgwriter_delay = 200ms
> bgwriter_lru_maxpages = 100
> bgwriter_lru_multiplier = 2
>
> Looking forward for suggestions.

Yep, increase checkpoint_segments. And you probably want to raise
checkpoint_timeout too.

--
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com