Re: Proving or Debunking the need for rebuilding

Ben wrote:
> hpuxrac wrote:
> > Ben wrote:
> > > 9.2.0.5 EE AIX5L
> > >
> > > Ok so I do believe everyone when they say to quit rebuilding indexes,
> > > except for certain special cases ( like large purges on tables that
> > > will never grow again unless the moon is full and the wind blows
> > > eastward). I do understand that rebuilds can be harmful, BUT how do I
> > > prove one way or the other?
> > >
> > > I want to create matrices on the before and after of an index rebuild.
> > > How? I don't want to blindly say, "Yes this index needs to be rebuilt"
> > > I want to show the performance gain or loss from a rebuild. Surely
> > > there is a way to do this. Do you simply anayze ... validate and
> > > capture the statistics on the indexes?
> > >
> > > Thanks for any ideas and help.
> >
> > Check out Tom Kyte's site http://asktom.oracle.com this whole area is
> > documented extensively there.
> >
> > Also Jonathan Lewis's site.
>
>
> I guess I must have looked over the posts, but I have been to Tom's
> site extensively and Jonathan Lewis's.
> I've search benchmarking and matrix.. any other good keywords that you
> obviously know since you're suggesting the site?

Try asktom searching with 2 words ... index rebuild

I will take a quick look at Jonathan's site next Received on Thu Nov 09 2006 - 13:51:43 CST