RE: Merge

Sometime I feel like we should have a support group for DBA's that have to deal 
with this.  I feel helpless trying to unwind some of the dooda I see at my 
place of employment.  My brain just can't handle it and I have been unable to 
find a way to break the problem down into smaller pieces.  Views on views on 
views on views.

From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Goulet, Richard
Sent: Tuesday, July 06, 2010 8:52 AM
To: Toon Koppelaars
Cc: ORACLE-L
Subject: RE: Merge

Yep, they are really complex views, which is why the duhvelopers don't want to 
use them directly.  Course a good pile of that is the complexity with which 
they wrote them, view on top of several dynamic views which themselves are on 
top of dynamic views.  You know "spaghetti code".


Dick Goulet
Senior Oracle DBA/NA Team Lead
PAREXEL International


________________________________
From: Toon Koppelaars [mailto:toon.koppelaars@xxxxxxxxxxx]
Sent: Tuesday, July 06, 2010 9:23 AM
To: Goulet, Richard
Cc: ORACLE-L
Subject: Re: Merge
The DELETE clause for the MERGE statement cannot help you here?

Are the views too complex to turn them into materialized views that can be 
fast-refreshed every 15 minutes?

On Tue, Jul 6, 2010 at 2:26 PM, Goulet, Richard 
<Richard.Goulet@xxxxxxxxxxx<mailto:Richard.Goulet@xxxxxxxxxxx>> wrote:

All,

        Not often that I ask for assistance from the list, but I'm a bit 
baffled by this one.

        We have a number of reporting tables that get populated every 15 
minutes from an equal number of views.  The developers are saying that to run 
the reports off of the views is too long for customer acceptance.  The current 
process is to delete all rows form the tables, no not truncate, that would be 
too easy.  And then populate the tables with a select * from the view in 
question.  I'm looking at the merge command to replace this and the tons of 
redo that it produces and has to be shipped to a standby on a very small straw. 
 To put is mildly the db is 74GB is size & produces 150GB of redo a day.  Now 
I'd simply shutoff the redo for that tablespace, but they claim that the 
standby HAS to be able to come up on a moments notice & be fully available.  
Yeah, this is a pile of Duhvelopers.

        Now Merge as I see it handles 90% of what we need, but my problem is 
that if a row is not matched because it no longer exists in the source view, 
how do you delete it?

Dick Goulet
Senior Oracle DBA/NA Team Lead
PAREXEL International
900 Chelmsford St, Suite 310
Lowell, MA 01821
978.614.2857
Richard.Goulet@xxxxxxxxxxx<mailto:Richard.Goulet@xxxxxxxxxxx>
http://www.parexel.com

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