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Try adding the fields in the WHERE clause to be part of the key of the
logical. That may help, as there is now a sort on those fields.
Michael Schutte
Work 614-492-7419
email michael_schutte@xxxxxxxxxxxx
"Kyle Collie"
<kcollie@xxxxxxxx
m> To
Sent by: "RPG programming on the AS400 /
rpg400-l-bounces@ iSeries" <rpg400-l@xxxxxxxxxxxx>
midrange.com cc
Subject
03/30/2006 09:27 Re: Embedded SQL Logical file use
AM
Please respond to
RPG programming
on the AS400 /
iSeries
<rpg400-l@midrang
e.com>
Yea, I failed to mention that I was posting for a colleague and I just
pasted his text into the post. He is using SQLRPGLE. This is static
SQL.
I have suggested that he try adding the select/omit logic from his
logical to the where clause, thinking that this might help give the
optimizer a better clue as to what he is trying to do.
He has written it in record level access and it runs in about the same
total time. The 25% time lost while the optimizer churns would be a
big boost if we could recover it.
Does the access plan not get stored with the *pgm object?
KC
On 3/30/06, Michael_Schutte@xxxxxxxxxxxx <Michael_Schutte@xxxxxxxxxxxx>
wrote:
> Kyle, You mentioned that you are using SQLRPG, can I assume that you
meant
> SQLRPGLE? If not, try converting the code to SQLRPGLE. I have a program
> that I prepare a statement and depending on the user selection, I pick
> which file that needs to be used in the SQL statement.
>
> For example, if the user chooses to search the employee master by last
> name, I chose a logical file that has the last name as the first part of
> the key. If user chooses company and department, then I choose a logical
> file that has company and department first. My processing time in this
> program went from 5 minutes to 10 seconds.
>
> Something in the WHERE statement is causing SQL to search for a better
> file.
>
> You could always not write it in SQL... Then you will not have to worry
> about it.
>
> Michael Schutte
> Work 614-492-7419
> email michael_schutte@xxxxxxxxxxxx
>
>
>
> "Kyle Collie"
> <kcollie@xxxxxxxx
> m>
To
> Sent by: "RPG List" <rpg400-l@xxxxxxxxxxxx>
> rpg400-l-bounces@
cc
> midrange.com
>
Subject
> Embedded SQL Logical file use
> 03/29/2006 06:41
> PM
>
>
> Please respond to
> RPG programming
> on the AS400 /
> iSeries
> <rpg400-l@midrang
> e.com>
>
>
>
>
>
>
> We have an SQLRPG module that is opening a cursor based on a S/O
> logical. Everytime the program is run the query optimizer is checking
> for a better file to use and is eventually just coming back and using
> the initial S/O logical that we specified in the select statement. Is
> there a way to force the logical and prevent that processing time that
> is wasted when it tries to find a better index?
>
> The time it takes up is about 1 minute 20 seconds.
>
> Thanks in advance,
>
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