and Millsap with two Ls, not one.
> -----Original Message-----
> From: oracle-l-bounce_at_freelists.org
> [mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Bobak, Mark
> Sent: mercredi, 3. mars 2004 10:21
> To: oracle-l_at_freelists.org
> Subject: RE: RE: query slow in 9i, but not slow in 8i
>
>
> Looks like you got a reply too. By the way, his name is
> Cary, not Carrie. ;-)
>
> -----Original Message-----
> From: ryan.gaffuri_at_cox.net [mailto:ryan.gaffuri_at_cox.net]
> Sent: Wednesday, March 03, 2004 11:47 AM
> To: oracle-l_at_freelists.org
> Subject: RE: RE: query slow in 9i, but not slow in 8i
>
>
> i put this on asktom and did a name drop to ensure a
> response(hope that was ok).
>
> http://asktom.oracle.com/pls/ask/f?p=4950:8:469012999885085128
> 6::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:707586567563,
>
> my post is at the bottom of the thread.
> >
> > From: "Cary Millsap" <cary.millsap_at_hotsos.com>
> > Date: 2004/03/03 Wed AM 10:50:30 EST
> > To: <oracle-l_at_freelists.org>
> > Subject: RE: RE: query slow in 9i, but not slow in 8i
> >
> > Not a big query at all. If I recall correctly, the query
> ran in about a
> > minute and a quarter--something like 1:15.0, with 1:14.5
> consumed in the
> > parse. It was some kind of a bug, but I can't remember
> which. Now that I
> > think about it, I'm not even sure whether it was histograms or
> > partitions that was causing the problem. Not a lot of
> value, this foggy
> > anecdote of mine :).
> >
> >
> > Cary Millsap
> > Hotsos Enterprises, Ltd.
> > http://www.hotsos.com
> > * Nullius in verba *
> >
> > Upcoming events:
> > - Performance Diagnosis 101: 3/23 Park City, 4/6 Seattle
> > - Hotsos Symposium 2004: March 7-10 Dallas
> > - Visit www.hotsos.com for schedule details...
> >
> >
> > -----Original Message-----
> > From: oracle-l-bounce_at_freelists.org
> > [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Mladen Gogala
> > Sent: Wednesday, March 03, 2004 8:23 AM
> > To: oracle-l_at_freelists.org
> > Subject: Re: RE: query slow in 9i, but not slow in 8i
> >
> > Parse time over a minute? Was it a huge query or not? I
> find it hard to
> > believe.
> >
> >
> > On 03/02/2004 09:36:10 PM, Cary Millsap wrote:
> > > I don't have access to the data to back this up, but I
> have seen PARSE
> > > call response time move from over a minute to less than a
> second by
> > > eliminating histograms from the equation. I think when I last saw
> > this,
> > > it was an Oracle8 system.
> > >
> > >
> > > Cary Millsap
> > > Hotsos Enterprises, Ltd.
> > > http://www.hotsos.com
> > > * Nullius in verba *
> > >
> > > Upcoming events:
> > > - Performance Diagnosis 101: 3/23 Park City, 4/6 Seattle
> > > - Hotsos Symposium 2004: March 7-10 Dallas
> > > - Visit www.hotsos.com for schedule details...
> > >
> > >
> > > -----Original Message-----
> > > From: oracle-l-bounce_at_freelists.org
> > > [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of
> Wolfgang Breitling
> > > Sent: Monday, March 01, 2004 10:30 PM
> > > To: oracle-l_at_freelists.org
> > > Subject: Re: RE: query slow in 9i, but not slow in 8i
> > >
> > > There surely is some "cost" involved in evaluating a
> histogram during
> > > the
> > > parse phase, but I doubt that it will be significant enough to be
> > > measurable. But histograms change the estimates of the
> CBO and it is
> > > quite
> > > possible that the presence of a histogram on a column where the
> > content
> > > is
> > > not skewed enough to really warrant a histogram can change the
> > estimates
> > >
> > > enough to cause the optimizer to use a different, slower
> access path
> > > than
> > > without the histogram.
> > >
> > > At 09:14 PM 3/1/2004, you wrote:
> > >
> > > >I am unfortunately speaking from heresay, however I
> heard once that
> > > having
> > > >histograms all over the place can slow down parsing as
> they have to
> > be
> > > >inspected. I was left with the impression that unless
> the data is
> > > skewed
> > > >enough to warrant a histogram then there actually is a
> negative cost
> > > >associated with having too many histograms.
> > > >
> > > >Surely someone on this list can either support me or
> shoot me down on
> > > this
> > > >one?
> > >
> > > Wolfgang Breitling
> > > Oracle7, 8, 8i, 9i OCP DBA
> > > Centrex Consulting Corporation
> > > http://www.centrexcc.com
> > >
> > > ----------------------------------------------------------------
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Received on Wed Mar 03 2004 - 13:08:28 CST
