Re: Index Rebuilds and Extents

Hi,

If you are rebuilding nightly I would choose to go for one extent no matter if they are uniform extent sizes.

I do a similar thing here where I drop all indexes, coalesce the index tablespace and then rebuild them all. This works because the database is small, but I can imagine that on a huge database a nightly window is not enough for index rebuilds.

Jack

Lisa_Koivu_at_gelco.com_at_fatcity.com on 05/05/2000 05:28:00 PM

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Subject: Index Rebuilds and Extents

Hello everyone, happy Friday!

I am overhauling an index rebuild script. The indexes in this script are dropped and rebuilt nightly. Yesterday when I was revisiting storage, my goal was to see if I could get the minimum number of extents possible when rebuilding each index, so I re-set my initial extent size to be large enough, in some cases 150M (non partitioned). However after doing so I began to wonder, am I exacerbating fragmentation by doing this? Even if each index is dropped and rebuilt nightly?

So here's my question to you:

What's better: Having an index all in one extent or having uniform extents in the tablespace that the indexes reside in? After thinking about it I'm beginning to lean toward uniform extents.

Your input is appreciated.
Thanks
Lisa

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