Re: SQL Views - worth it ?

Dave

Some years ago following a similar issue I've opened a *D*esign *C*hange *R*
equest (MRT MR033115573)

asking for a MQT's feature " REFRESH IMMEDIAT MAINTAINED BY SYSTEM" to be
available.

I've even had some responses from IBM but got no further. see following.

If others seconds this DCR it may help...


*Design Change Request *- Thank You for your Design Change Request
submission regarding System i.

You request has been acknowledged and issued the following
Marketing Requirement Tracking number : MR033115573


*Title* : MQT's REFRESH IMMEDIAT MAINTAINED BY SYSTEM

*Description *: the following MQT creation is available for some years now.
I'd like to know if REFRESH IMMEDIAT MAINTAINED BY SYSTEM will be available
anytime soon

CREATE TABLE DailyMQT AS
(SELECT Branch, salesdate,
SUM(Revenue) as Total_Revenue,
SUM(Units) as Total_Units,
FROM SalesDetails
GROUP BY Branch, salesdate)
DATA INITIALLY IMMEDIATE
REFRESH DEFERRED
MAINTAINED BY USER;


Alternately, enabling a LF over a LF might do the trick as well.


Gad

I agree 100%. I am not impressed with DB2 SQL Views. Even adding
indexes doesn't improve their performance enough since, as you pointed
out, they are materialized at execution time. So, there is no way they
can perform as well as DDS Logical files. But I have heard some strong
adherents claim that SQL Views perform just as well as DDS Logical file.
Well, I disagree -- been their, got that T-shirt. Had to go with an MQT
to get the performance of a DDS Logical file except that MQT's are not
updatable.

Sincerely,

Dave Clark
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