Re: perplexing performance on AIX

Not that I want to discourage any potential comedians, but I do understand the concept of idle waits. However, the wait event seems excessive, (its larger than any other timed event on the system, to include CPU time), which makes me suspect that there is a problem.

On Tue, May 6, 2008 at 3:11 PM, Baumgartel, Paul < paul.baumgartel_at_credit-suisse.com> wrote:

> On Tue, May 6, 2008 at 2:21 PM, Allen, Brandon <Brandon.Allen_at_oneneck.com>
> wrote:
>
> > If you disabled parallellism, you couldn't get PX wait events. You
> > might want to try with DOP of 1. I'd also verify CIO is being used if you
> > aren't sure.
> >
>
>
> Reminds me of the old Henny Youngman joke: "I went to the doctor. I said
> 'Doc, it hurts when I do this.' He said 'Don't do that.'"
>
> *Paul Baumgartel*
> *CREDIT SUISSE*
> Information Technology
> Prime Services Databases Americas
> One Madison Avenue
> New York, NY 10010
> USA
> Phone 212.538.1143
> paul.baumgartel_at_credit-suisse.com
> www.credit-suisse.com
>
>
> ------------------------------
> *From:* oracle-l-bounce_at_freelists.org [mailto:
> oracle-l-bounce_at_freelists.org] *On Behalf Of *John Smith
> *Sent:* Tuesday, May 06, 2008 3:29 PM
> *To:* Allen, Brandon; oracle-l_at_freelists.org
> *Subject:* Re: perplexing performance on AIX
>
> We really want to be able to use parallel.
>
>
> > ------------------------------
> > *From:* John Smith [mailto:john40855_at_gmail.com]
> > *Sent:* Tuesday, May 06, 2008 11:57 AM
> > *To:* Allen, Brandon
> > *Subject:* Re: perplexing performance on AIX
> >
> > Yes, we tried decreasing the DOP. Didnt really affect the wait
> > event. I am pretty sure the drives are already mounted w/ CIO. At least
> > they are supposed to be.
> >
> > On Tue, May 6, 2008 at 1:20 PM, Allen, Brandon <
> > Brandon.Allen_at_oneneck.com> wrote:
> >
> > > Have you tried decreasing the degree of parallelism (or maybe
> > > even disabling it) to see if that helps? Sometimes too muchparallelism is
> > > a bad thing.
> > >
> > > You might also want to consider using concurrent IO if you're not
> > > already.
> > >
> > > Regards,
> > > Brandon
> > >
> > >
> > >
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