FreeLists / oracle-l / Re: MView... Fresh build is much faster than Complete refresh...

["Jared Still" <jkstill@xxxxxxxxx>]

On 8/21/07, 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.
>
>
10g, right?

Try using atomic_refresh:

Here's an example from a thread here a few months ago:

begin
   -- dbms_mview.refresh('MVTEST_MV',method => 'C');
   -- use this with 10g to return to truncate/append behavior
   dbms_mview.refresh('MVTEST_MV',method => 'C', atomic_refresh=>false);
end;
/

The default refresh in 10g changed to delete/insert.

In 9i it was truncate/insert append.


-- 
Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist