Have you ran a Visual Explain over your query that is using the view? You
might be running a table scan or something else to slow down query. Might
need an index created. Without running Visual Explain pretty hard to know.

On Fri, Aug 24, 2018 at 12:04 PM Greg Wilburn <
gwilburn@xxxxxxxxxxxxxxxxxxxxxxx> wrote:

My limited experience with SQL views (and views within views) for
reporting is that they are invaluable. You also have tools (index advisor)
that can improve performance dramatically. Running tools like DB2 WebQuery
and others would have been nearly impossible with our legacy database,
without using SQL views.

Personally, I would not be thinking about DDS described logical files.
Just my humble opinion.

Greg

-----Original Message-----
From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Thomas
Garvey
Sent: Friday, August 24, 2018 2:11 PM
To: RPG programming on the IBM i (AS/400 and iSeries) <
rpg400-l@xxxxxxxxxxxx>
Subject: SQL Views worth it?

Hi,

I'm developing a new application and trying to have the DB do as much of
the work as possible.
So, I'm incorporating SQL Views but finding the throughput underwhelming.
Granted that some of the views are based on other views (in keeping with
the attempt to have the DB do some work for me) but it appears that every
time a view is queried the views are rebuilt by the OS.

I read somewhere that Views can be considered somewhat like logical files,
but at least logicals can be set to have immediate updates as underlying
physicals change.
Views have no such attribute settings.

So, what's considered best practices for SQL Views?
Should I just rewrite these things as logicals?

--

Best Regards,

Thomas Garvey


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