RE: Index compression on Oracle 9.2

From: Herring Dave - dherri <Dave.Herring_at_acxiom.com>
Date: Thu, 2 Feb 2006 13:15:00 -0600
Message-ID: <7ED53A68952D3B4C9540B4EFA5C76E360165826D@CWYMSX04.Corp.Acxiom.net>

> By my opinion the feature is absolutely grate (whilst table
> compression is rubbish).

Could you elaborate on the "rubbish" comment above? The reason I ask is that I've seen a pretty good compression percentage in the past at the table level. We had a bunch of tables as part of an initial build that we wanted around, but needed them to cough up some of the space (I think they were consuming 300 - 400GB of space). I rebuilt them using CTAS, ordering by the columns with cardinality < 50, up to 5 of them, in order by lowest cardinality to higher. Doing this the compression dropped the table sizes to around 60% of their original size. Table compression is pretty effective, in my experience, for this use.

Dave

Dave Herring, DBA
Acxiom Corporation
3333 Finley
Downers Grove, IL 60515
wk: 630.944.4762
<mailto:dherri_at_acxiom.com>

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Received on Thu Feb 02 2006 - 13:15:00 CST