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Re: Redo Problem ... Find from Statspack

From: Steve Robin <ocmaman_at_gmail.com>
Date: Wed, 17 Oct 2007 09:56:28 -0700
Message-ID: <1192640188.376289.5320@q3g2000prf.googlegroups.com>


On 17 Oct, 16:55, DA Morgan <damor..._at_psoug.org> wrote:
> Steve Robin wrote:
> > Hi,
>
> > Two days before performance was down.... I find that log file sync and
> > redo allocation latch was high.... now is there any way to find which
> > queries or session were generating so many redo.
>
> > Thanks
>
> > Oracle : 9.2
> > Server : Solaris
>
> Define "log file sync and redo allocation latch was high."
>
> Compared to a baseline or just a big number and you are assuming that
> it indicates an issue?
> --
> Daniel A. Morgan
> University of Washington
> damor..._at_x.washington.edu (replace x with u to respond)
> Puget Sound Oracle Users Groupwww.psoug.org

Daniel,

I had given the values with log sync, about redo allocation.

Latch Name                       Requests      Misses      Sleeps
Sleeps 1->4
------------------Problem Performance
redo allocation                19,830,541      32,005          25
31980/25/0/0
                                                                                    /
0
-------------------Right Performation
redo allocation                19,813,484      72,544           4
72540/4/0/0/  

0

as well as I found following latch in problematic report which was not in right report.

mostly latch-free SCN 23,251 190 1 189/1/0/0/0

Please suggest.

Thanks Received on Wed Oct 17 2007 - 11:56:28 CDT

Original text of this message

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