Oracle-L: alter table tabname drop column colname checkpoint #;

From: Orr, Steve <sorr_at_rightnow.com>
Date: Fri, 22 Mar 2002 12:00:30 -0800
Message-ID: <F001.0043138D.20020322120030@fatcity.com>

I've got a "process" which is consuming RBS to the point of failure (running out of tablespace). I have very little control of the code so using set transaction is not a possibility.

The SQL that is failing is "alter table tabname drop column colname" with no checkpoint being specified. According to the documentation, when no checkpoint integer is specified then it defaults to committing every 512 rows but I suspect this is not happening hence the rollback problem. Does anyone have experience with dropping columns on large amounts of data and specifying the checkpoint integer? If you don't specify the checkpoint does it really default to 512 like the documentation says? How would I test the checkpoint default? (We're running Oracle 8172 on Linux.)

As an alternative I'm thinking about doing an "alter table tabname set unused column colname" then manually doing an "alter table tabname drop unused columns" later with a set transaction.

Any ideas?

Steve Orr
Bozeman, MT
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Author: Orr, Steve
INET: sorr_at_rightnow.com

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