RE: Refresh multiple MV's in a single transaction
- From: "Elliott, Patrick" <patrick.elliott@xxxxxxxxxxxxx>
- To: Michael Fontana <mfontana@xxxxxxxxxxx>, "finn.oracledba@xxxxxxxxx" <finn.oracledba@xxxxxxxxx>, "'Goulet, Richard'" <Richard.Goulet@xxxxxxxxxxx>
- Date: Wed, 5 Nov 2008 15:59:10 -0600
No...
This doesn't contradict the manual. The refresh group provides the
functionality that all of the MV's in the group will be read consistent with
each other only. That is what I read from what you have provided below. The
manual does not say that all MV's in the group will be refreshed with one
transaction. That is what would need to be done to get read consistency for
other queries referencing the MV's.
Pat
________________________________
From: Michael Fontana [mailto:mfontana@xxxxxxxxxxx]
Sent: Wednesday, November 05, 2008 3:55 PM
To: Elliott, Patrick; finn.oracledba@xxxxxxxxx; 'Goulet, Richard'
Cc: 'oracle-l'
Subject: 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@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Elliott, Patrick
Sent: Wednesday, November 05, 2008 3:42 PM
To: finn.oracledba@xxxxxxxxx; 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@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] 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<http://10.2.0.4>, I don't see why it would not work on
>10.2.0.2<http://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@xxxxxxxxxxx<mailto:Richard.Goulet@xxxxxxxxxxx>> 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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