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Home -> Community -> Mailing Lists -> Oracle-L -> RE: MView... Fresh build is much faster than Complete refresh...
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?
RF
Robert G. Freeman
Oracle Consultant/DBA/Author
Principal Engineer/Team Manager
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-- http://www.freelists.org/webpage/oracle-lReceived on Wed Aug 22 2007 - 10:13:39 CDT
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