Re: Embedded SQL Logical file use -- RPG400-L

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
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>              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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