Re: Oracle 9i vs 10g MV refresh behaviour

Thanks for the update. It means the only way is to modify all MV to refresh with Atomic Refresh. I have a DW where we have several big 200+G MV refreshed qurterly. Here Delete can be big issue and so trying to test it before planning the upgrade in Test env.

Sanjay

• Original Message ---- From: "Freeman, Donald" <dofreeman_at_state.pa.us> To: piontekdd_at_gmail.com; smishra_97_at_yahoo.com Cc: oracle-l_at_freelists.org Sent: Wednesday, March 5, 2008 2:53:14 PM Subject: RE: Oracle 9i vs 10g MV refresh behaviour

To get them to act like they did in 9i you have to use "Atomic Refresh" in your refresh options.  

Donald Freeman
Database Administrator II
Commonwealth of Pennsylvania
Department of Health
Bureau of Information Technology
2150 Herr Street
Harrisburg, PA 17103
dofreeman_at_state.pa.us    

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Bradd Piontek Sent: Wednesday, March 05, 2008 2:09 PM
To: smishra_97_at_yahoo.com
Cc: oracle-l_at_freelists.org
Subject: Re: Oracle 9i vs 10g MV refresh behaviour

Sanjay,
  Yes, this is the default behavior in 10g and to modify it you need to use the DBMS_MVIEW package (easy enough to script or write an anonymous PL/SQL for). I personally like the change in behavior as it makes the data more accessible (always had those users hitting the table while the refresh was occuring and seeing empty rows).

I'm not sure what happens when you upgrade. I would guess the views would work as they did in 9i and only work as the default if you changed them or re-created them, but I could be wrong.

Bradd

On Wed, Mar 5, 2008 at 12:49 PM, Sanjay Mishra <smishra_97_at_yahoo.com> wrote:

Is it correct that upgrading from 9i to 10g will change the MV refresh behaviour. I checked in one forum that it will use delete command for complte refresh instead of Truncate. Has anybody seen this issue. If this is true then Is there any parameter in init.ora that can change the default behaiour of 9i like using Truncate. I checked the forum and they are referring Atomic Refresh attribute in DBMS_mview can revert the process but it is not good to modify several MV.  

Is it only true when we move from 9i to 10g or also true if MV are created in 10g itself.  

TIA
Sanjay

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