Re: Shrink Table: IEstimating Rollback Space

Undo (and Redo !) will be quite noticeable-- more so as you have indexes on the table.

A SHRINK operates as a DELETE (which will be the very significant portion of Undo) *and* an INSERT.
Both operations also have to update Indexes . The Indexes will not shrink until and unless you do a COALESCE or REBUILD.

See MetaLink Note#577375.1 and Bug# 3888229.

Hemant K Chitale

At 04:52 AM Friday, Ian MacGregor wrote:
>I have a 450 GB table with 150 GB of free space. I'd like to shrink the
>table, but I'm not sure how much rollback will be needed. Is there a
>formula? One that accounts for the indexes as well?
>
>Ian MacGregor
>SLAC National Accelerator Laboratory
>
>--
>http://www.freelists.org/webpage/oracle-l

Hemant K Chitale
http://hemantoracledba.blogspot.com

"A 'No' uttered from the deepest conviction is better than a 'Yes' merely uttered to please, or worse, to avoid trouble." Mohandas Gandhi Quotes
: http://www.brainyquote.com/quotes/authors/m/mohandas_gandhi.html

--
http://www.freelists.org/webpage/oracle-l