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

From: Zhu,Chao <zhuchao_at_gmail.com>
Date: Wed, 22 Aug 2007 15:16:10 +0800
Message-ID: <962cf44b0708220016y31e73d3bl2d0887762d77e8d7@mail.gmail.com>


take a 10046 trace and do a compare.
maybe it is doing a long delete before refresh, maybe truncate takes long... i think a single table refresh does the truncate , and refresh within a group does the delete.

On 8/22/07, Robert Freeman <robertgfreeman_at_yahoo.com> wrote:
>
>
> So I have this materialized view. When I execute the create materialized
> view command, it takes 32.39 seconds to build. A complete refresh (exec
> dbms_mview.refresh('mview_name','C'); ) from the prompt
> this takes almost 3-4 times longer. Does anyone have any thoughts on why
> this might be so just right off hand. I've not run a 10046 on it yet, but I
> thought maybe there is something about MVIEW Full Refreshes that I'm just
> missing.
>
> RF
>
>
>
> Robert G. Freeman
> Oracle Consultant/DBA/Author
> Principal Engineer/Team Manager
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> from Osborne/McGraw Hill (Oracle Press)
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> BLOG: http://robertgfreeman.blogspot.com/
> Sig V1.2
>

-- 
Regards
Zhu Chao
www.cnoug.org
--
http://www.freelists.org/webpage/oracle-l
Received on Wed Aug 22 2007 - 02:16:10 CDT

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