On Dec 16, 2007 1:03 AM, Heikki Linnakangas <[EMAIL PROTECTED]> wrote:
> Gokulakannan Somasundaram wrote: > > I was going to say that I'm really only interested in physical I/O. > Logical > >> I/O which is satisfied by the kernel cache is only marginally > interesting > >> and > >> buffer fetches from Postgres's shared buffer is entirely uninteresting > >> from > >> the point of view of trying to figure out what is slowing down a query. > > > > Ok the Physical I/Os are already visible, if you enable > log_statement_stats. > > I think you missed the point. What log_statement_stats shows are not > physical I/Os, they're read() system calls. Unfortunately there's no > direct way to tell if a read() is satisfied from OS cache or not. Greg's > suggestion was about how to do that. > Oh OK. Thanks for clarifying.. -- Thanks, Gokul. CertoSQL Project, Allied Solution Group. (www.alliedgroups.com)
