RE: SQLRPG Program performance

["Goodbar, Loyd (ETS - Water Valley)" <LGoodbar@xxxxxxxxxxxxxx>]

The easiest way to improve performance is to create indexes on ptcntl (your
select distinct and selection crtiteria), ptcmpy (selection criteria), and
ptloc (selection criteria). Otherwise, the optimizer must perform table
scans to determine if rows should be part of the select.

Loyd Goodbar
Senior programmer/analyst
BorgWarner
E/TS Water Valley
662-473-5713
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Ahmed Yusuf
Sent: Monday, May 09, 2005 05:13
To: Midrange-L
Subject: SQLRPG Program performance

I have a SQLRPG program, and it has multiple SQL Statements. When I run
PRTSQLINF for this program, it shows the estimated query run time, and most
of them have 1second estimated run time, but one of them has 8 seconds
estimated run time.

 

Statement:-

"C+          SELECT DISTINCT PTCNTL              

C+          INTO :CNTL FROM EPTMST              

C+          WHERE PTCNTL = :SCTL03 AND          

C+          PTCMPY BETWEEN :S2LCO AND :S2HCO AND

C+          PTLOC  BETWEEN :S2LLC AND :S2HLC"

 

SQL4021  Access plan last saved on 09/05/05 at 11:53:23.


SQL4020  Estimated query run time is 8 seconds.


SQL402D  Query attributes overridden from query options file QAQQINI in
library QUSRSYS. 

SQL4017  Host variables implemented as reusable ODP.


SQL4010  Table scan access for table 1.


 

 

My question is, is this estimated time really denotes the performance of the
program. And if yes, how can I improve the performance of it.

 

Waiting for reply

 

AH