I am on Fedora 12 (x86_64). Will eventually be on RHE.
> Date: Tue, 25 May 2010 12:59:16 -0500 > From: kevin.gritt...@wicourts.gov > To: b...@hotmail.com; pgsql-admin@postgresql.org > Subject: Re: [ADMIN] How to find if a SELECT is reading from buffer or > disk ? > > Balkrishna Sharma <b...@hotmail.com> wrote: > > > I am increasing the shared_buffer size in postgresql.conf and want > > to measure its effect on READ. In essence I want to know if the > > SELECT queries I am firing repeatedly is reading from the buffer > > or going directly to the disk. > > There's a third option -- PostgreSQL reads and writes will normally > go through the OS cache. > > > Right now I am just looking at execution time of the SELECTs and > > trying to conclude. But there should be a direct way to see where > > the SELECT reads from. > > How can I accomplish this ? > > You didn't mention your OS. There's usually a way to monitor disk > I/O built in to the OS. I usually start with: > > vmstat 1 > > -Kevin > > -- > Sent via pgsql-admin mailing list (pgsql-admin@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-admin _________________________________________________________________ The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with Hotmail. http://www.windowslive.com/campaign/thenewbusy?tile=multicalendar&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_5
