On 15.11.2006 13:17, Richard Foote wrote:
> "Mladen Gogala" <mgogala.spam-me-not_at_verizon.net> wrote in message
> news:pan.2006.11.15.09.18.24.305181_at_verizon.net...
>> On Wed, 15 Nov 2006 07:42:37 +0000, Richard Foote wrote:
>>
>>> Now this could be attributed to an index rebuild but then again it might
>>> not. For example, I assume you re-analyze the index after the rebuild ?
>>> What
>>> are the differences in index statistics before/after the rebuild ? When
>>> was
>>> the index last analyzed prior to the rebuild ? There was one classic
>>> thread
>>> here a while ago where Mike Ault swore an index rebuild changed the
>>> clustering factor of an index only to realize (eventually and somewhat
>>> painfully) that the rebuild made no difference to the CF, it was simply
>>> the
>>> statistics being no longer fully up to date. Is it possible that by
>>> simply
>>> re-analyzing the index/table, performance improves without the need for
>>> the
>>> rebuild ? I've seen this on various occasions ...
>> There is also a classic presentation about indexes on OAUG now moved
>> to Miracleas.dk:
>> http://www.miracleas.dk/images/upload/Docs/Richard%20Foote.pdf
>> I find the myth debunking section hilarious. That presentation explained
>> CF to me long before Jonathan's book.
>>
>
> Hi Mladen
>
> Hey, I think I've seen that presentation somewhere before ...
>
> Must read it one day ;)
Been there, done that. It's a valuable read. I can really recommend it
to /you/. :-)
robert
Received on Wed Nov 15 2006 - 07:33:00 CST
