Re: UNUSABLE Indexes
Date: Thu, 27 Dec 2007 11:17:37 -0800 (PST)
On Dec 27, 12:01 pm, "Jonathan Lewis" <jonat..._at_jlcomp.demon.co.uk> wrote:
> the update to the index after
> the insert /*+ append */ is a special ...
> by sorting the new entries and using a bulk-insert
> into the index leaf blocks).
> If the table has been truncated then the index has also been
> truncated, and the optimised update is similar in resource
> usage to a 'create' - however, create index does not generate
> undo, so will be a little more efficient. Moreover, the optimized
> update has to be logged, but if you end up with a create
> (or rebuild) you can choose to do it nologging.
OK, thanks that was very clear & enlightening.
--JH Received on Thu Dec 27 2007 - 13:17:37 CST