Re: automatic refresh of delta data for materialized views

Ferenc Mantfeld wrote:
>
> Hi All
>
> I have a very large data set for a DW and I created a materialized view on
> it to give me a quick access to group by and summarization results, I want
> some way to be able to update the MV with just the delta after I perform an
> incremental load to the base fact or dimension tables on which the MV is
> built. From what I have played with so far, I don't see a ready solution.
> Fast refreshes don't work when MV is on complex view. We are talking about
> dimension tables with possibly close to a billion rows, and fact tables of
> similar proportions, so the time taken to refresh the MV becomes a factor.
>
> Any useful suggestions, write-up's, white papers in this regard would be
> extremely helpful and welcome. Ta muchly in advance !
>
> Regards:
> Ferenc Mantfeld
> Senior Performance Engineer
> Siebel Performance Engineering
> Melbourne, 3000, VIC, Australia
>

Ferenc,

   This has just crossed my mind and perhaps that after I think harder I'll find it a foolish idea, but would it be possible to have snapshot logs (or their home-made equivalents) on all the tables in the view and building a 'delta view' on top of those logs ?

-- 
Regards,

Stephane Faroult
Oriole Software
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Please see the official ORACLE-L FAQ: http://www.orafaq.com
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Author: Stephane Faroult
  INET: sfaroult_at_oriole.com

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