Re: Buffer Cache question....

Medi Montaseri wrote:
> I am using PG 7.2 with fsync truned on but still need a more immediate
> write thru.
> Does PG uses the fsync (or open_sync, etc) just for the WAL or for
> tables as well ?

Just for WAL.

> I understand the consequence of limiting buffer cache but my application
> cares more about
> integrity than performance. I'd like to be able to write the data to the
> physical storage ASAP,
> or ideally 100% in sync mode.
>
> I have found that by reducing the checkpoint parameters I can write the
> data to disk sooner.
> For example
>
> checkpoint_segments = 1
> checkpoint_timeout = 30
>
> What else do I have to work with....?

PostgreSQL is already 100% reliable (pull plug and see) so I don't see
any value to changing those parameters.

--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073