RE: Refresh multiple MV's in a single transaction

If this is true, it is in contradiction to the manual, vis-à-vis:

Refresh Groups

To preserve referential integrity and transactional (read) consistency among multiple materialized views, Oracle has the ability to refresh individual materialized views as part of a refresh group. After refreshing all of the materialized views in a refresh group, the data of all materialized views in the group correspond to the same transactionally consistent point in time.

If your mview refresh group is not working as described above, I suggest you have a bug. Do you have any way to prove the read inconsistency of the finished product? As a workaround, could you not perhaps allow for a refresh window where no reports would be run, and no processing on the base tables is performed?

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Elliott, Patrick
Sent: Wednesday, November 05, 2008 3:42 PM To: finn.oracledba_at_gmail.com; Goulet, Richard Cc: oracle-l
Subject: RE: Refresh multiple MV's in a single transaction

So what you are saying is that the transactions that are performing the refresh of the group is are all getting read consistency, but commits occur after each MV is refreshed, so other users querying the MV's will not get read consistency. Correct?

Pat

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Finn Jorgensen
Sent: Wednesday, November 05, 2008 3:32 PM To: Goulet, Richard
Cc: oracle-l
Subject: Re: Refresh multiple MV's in a single transaction

That's what I thought it was for too, but it's not. See my original post :)

>This works on 10.2.0.4, I don't see why it would not work on 10.2.0.2:
>Dbms_Mview.Refresh_All_Mviews(Failures,'?','',TRUE,FALSE);

I will look into this although the "atomic_refresh" parameter is also present in dbms_mview.refresh(list) and defaults to "true" (according to the documentation) but it doesn't work like that.

Thanks!

Finn

On Wed, Nov 5, 2008 at 4:00 PM, Goulet, Richard <Richard.Goulet_at_parexel.com> wrote:

Look into refresh groups. You can have multiple MV's in a single refresh group. Oracle® Database Advanced Replication, 3 Materialized View Concepts and Architecture

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