RE: MView... Fresh build is much faster than Complete refresh...

From: Kerber, Andrew W. <Andrew.Kerber_at_umb.com>
Date: Wed, 22 Aug 2007 10:13:39 -0500
Message-ID: <D40740337A3B524FA81DB598D2D7EBB3097A8943@x6009a.umb.corp.umb.com>

I have spent a lot of time looking at materialized views, and (apologies to Oracle), in my experience they are really only useful if you can/have to do incremental refreshes. A create table as select is much faster if you do a complete refresh.

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Robert Freeman Sent: Wednesday, August 22, 2007 9:12 AM To: oracle-l
Subject: RE: MView... Fresh build is much faster than Complete refresh...

Thanks everyone, by the way, for all the feedback!! How I missed MVIEW Refreshes changing from Truncate to delete/insert in 10g I'll never know!!! I also appreciate Jared pulling out the old thread! Gotta do better on my research next time.

The atomic refresh took the refresh down to 51 seconds pretty reliably. Still about a 20 second difference, but better than what it was by far!!! I'm also going to setup a refresh group and see how long it takes (and make sure that 10g still is doing merges!!)

Does anyone know if this change to not use truncate was in 10gr2 or 10gr2?

Robert G. Freeman
Oracle Consultant/DBA/Author
Principal Engineer/Team Manager
The Church of Jesus Christ of Latter-Day Saints Father of Five, Husband of One,
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Received on Wed Aug 22 2007 - 10:13:39 CDT