How do I find out if that is the case .The no of new inserts/updates is much
lesser than the total no of rows in the tables.So why would the fast refresh
take longer .
Can we index the MV logs to speed up the process.
vikas
-----Original Message-----
Sent: Tuesday, August 28, 2001 4:11 PM
To: Multiple recipients of list ORACLE-L
It may be that your fast refresh is actually doing a lot of work. This
would happen if many rows in the source table were changed. If 99% of the
rows changed, then a complete refresh will be faster, because you don't have
the added overhead of reading the logs to determine which rows to refresh -
you just refresh them all.
If only 1% of the rows changed then the fast refresh will indeed be fast -
faster than a complete refresh.
Somewhere in between there's a break even point. It may be that many rows
have changed - enough to take you past the break even point.
----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]>
Sent: Tuesday, August 28, 2001 3:00 PM
> We've noticed that our fast refresh takes longer than complete refresh -
and
> that's puzzling .We have MV logs based on the PK of the FACT table - and
the
> MV's are JOIN ONLY .
> Any suggestions would be welcome !
>
> vikas
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> Please see the official ORACLE-L FAQ: http://www.orafaq.com
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> Author: Vikas Kawatra
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