Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Mailing Lists -> Oracle-L -> RE: MView... Fresh build is much faster than Complete refresh...

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?  

RF  

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,
Author of various geeky computer titles
from Osborne/McGraw Hill (Oracle Press)
Oracle Database 11g New Features Now Available for Pre-sales on Amazon.com!
BLOG: http://robertgfreeman.blogspot.com/ Sig V1.2          



NOTICE: This electronic mail message and any attached files are confidential. The information is exclusively for the use of the individual or entity intended as the recipient. If you are not the intended recipient, any use, copying, printing, reviewing, retention, disclosure, distribution or forwarding of the message or any attached file is not authorized and is strictly prohibited. If you have received this electronic mail message in error, please advise the sender by reply electronic mail immediately and permanently delete the original transmission, any attachments and any copies of this message from your computer system. Thank you.
--
http://www.freelists.org/webpage/oracle-l
Received on Wed Aug 22 2007 - 10:13:39 CDT

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US