Re: RE: table reorganizations

From: Nuno Pinto do Souto <nsouto_at_optusnet.com.au>
Date: Wed, 07 Jan 2004 14:59:33 -0800
Message-ID: <F001.005DC05C.20040107145933@fatcity.com>

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>
> I'm surprised at these responses. I'm asking what sql statement most
> people use to identify tables that need reorganization because of
> "holes".

You don't have to be. There is plenty of material available today online that demonstrates the futility of "religious" (meaning: dictated by dogma) reorganizations.

> We had an Oracle consultant here and he uses

A con-sultant, perheaps?

> What sql statement is used by others?

None. There is no such thing as a statement that will pinpoint a need for a reorg. Unless you can prove to yourself that reorganizing any given table will improve anything in your system, then just going through the motions because there is a "hole" is useless. "Holes" are not necessarily the same as "disasters".

If you are using a reasonably recent version of Oracle (something you should ALWAYS mention upfront is the version you are running), then you can get all the information you need from the data in the dictionary as well as the statistics info.

And guess what: that is also all the information Oracle itself needs and uses to work around any potential problems "holes" might have caused in the past.

Bottom line: only reorganize if you have a specific reason, purpose and target for doing so. Just doing it because a con-sultant's SQL statement says so, is turning yourself into a cookie-cutter DBA. Which may give your boss a very warm feeling about your position, but achieves preciously nothing in real terms.

Cheers
Nuno Souto
nsouto_at_wizofoz2k.com.au

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Author: Nuno Pinto do Souto
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Received on Wed Jan 07 2004 - 16:59:33 CST