Re: MView... Fresh build is much faster than Complete refresh...
- From: "Ghassan Salem" <salem.ghassan@xxxxxxxxx>
- To: "Robert Freeman" <robertgfreeman@xxxxxxxxx>
- Date: Wed, 22 Aug 2007 16:27:09 +0200
Robert,
are you on 10gR2?, if so, then set the atomic_refresh to false and try it
again
rgds
On 8/22/07, Robert Freeman <robertgfreeman@xxxxxxxxx> wrote:
>
> The plan is to do fast refreshes on demand. There will be some change,
> but not huge volumes of it.
>
> RF
>
>
> Robert G. Freeman
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> -----Original Message-----
> *From:* oracle-l-bounce@xxxxxxxxxxxxx [mailto:
> oracle-l-bounce@xxxxxxxxxxxxx]*On Behalf Of *Dan Norris
> *Sent:* Wednesday, August 22, 2007 6:38 AM
> *To:* salem.ghassan@xxxxxxxxx
> *Cc:* oracle-l
> *Subject:* Re: MView... Fresh build is much faster than Complete
> refresh...
>
> You're doing a complete refresh, so logs on the base tables won't matter.
> If you do decide to keep logs and do (or attempt) fast refreshes, consider
> whether that's the best approach given the amount of change on the base
> tables. If the base tables change a lot between refreshes, it may be faster
> to do a complete refresh (assuming you cure the issue you're encountering
> below).
>
> Dan
>
> ----- Original Message ----
> Robert,
> do you have MV logs on the base tables?, the are cleaned up upon refresh,
> so if they are 'big', it may explain the result, also, how many indexes do
> you have on this MView?
>
> rgds
>
> On 8/22/07, Robert Freeman <robertgfreeman@xxxxxxxxx> wrote:
> >
> > So I have this materialized view. When I execute the create
> > materialized view command, it takes 32.39 seconds to build. A complete
> > refresh (exec dbms_mview.refresh('mview_name','C'); ) from the prompt this
> > takes almost 3-4 times longer. Does anyone have any thoughts on why this
> > might be so just right off hand. I've not run a 10046 on it yet, but I
> > thought maybe there is something about MVIEW Full Refreshes that I'm just
> > missing.
> >
> > RF
> >
> >
>
>
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