Re: Embedded SQL performance question.

[<myrickjr@xxxxxxxxxxxxx>]

Steve,

I have ran into the same problem with interactive showing great results and 
then the program runs slow compared to the interactive. Can you post the SQL 
please. Here are some things that I have learned that might help.

Have you run the RPG program in debug to see what SQL diagnostic messages
are logged in the job log?  If you would send the job log I would take a look 
at it.

Also are you referencing the logical directly in the sql statement? I have 
always been told not to directly reference in an SQL statement due to the fact 
that it might caues problems with the optimizer. I would try referencing the 
physical file itself to see if that helps. In all of my sql statements that I 
create I only have one that references a LF. The only reason for that is 
because the PF is a multi-member file and the LF includes all members. In other 
time I have reference LF has caused problems.

Hope some of this helps.

> 
> From: Steve Cross <SCross@xxxxxxxxxxxxxxxx>
> Date: 2003/11/13 Thu PM 02:34:02 EST
> To: rpg400-l@xxxxxxxxxxxx
> Subject: Embedded SQL performance question.
> 
> Hi,
>  
> I have an embedded SQL statement in my RPG program
> 
> It's a typical select statement over a logical file. 
> 
> the where selections and the order by are against the 1st two primary key
> fields.
> 
> when I execute this statement using Interactive SQL it runs fine. quick
> response and debug says it chose the logical access path
> 
> when I run it in the RPG program the optimizer builds its own access path
> and takes 3 minutes to execute. 
> 
> the statements are identical.
> 
> what am I doing wrong.  I am running OS V5R2
> 
> Thanks in advance,
> Steve
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