RE: SQL Update in RPGLE.

Are we gonna whip this dead horse AGAIN?? 


Thanks,
Tommy Holden


-----Original Message-----
From: rpg400-l-bounces+tommy.holden=hcahealthcare.com@xxxxxxxxxxxx
[mailto:rpg400-l-bounces+tommy.holden=hcahealthcare.com@xxxxxxxxxxxx] On
Behalf Of Michael_Schutte@xxxxxxxxxxxx
Sent: Friday, March 31, 2006 8:21 AM
To: RPG programming on the AS400 / iSeries
Subject: RE: SQL Update in RPGLE.

???  RPG doesn't have an access path?  If you can SETLL and READE right
away on a Logical file, you can get faster processing time when SQL
"may"
need to create a new access path.  I've had RPG programs run faster than
SQL and SQL programs that have run faster than RPG.  The slower SQL
programs are usually because the SQL couldn't find a suitable access
path
and created a new one on the fly.

Michael Schutte
Work 614-492-7419
email  michael_schutte@xxxxxxxxxxxx


 

             "Wilt, Charles"

             <CWilt@xxxxxxxxxx

             om>
To 
             Sent by:                  "RPG programming on the AS400 /

             rpg400-l-bounces@         iSeries" <rpg400-l@xxxxxxxxxxxx>

             midrange.com
cc 
 

 
Subject 
             03/31/2006 09:15          RE: SQL Update in RPGLE.

             AM

 

 

             Please respond to

              RPG programming

              on the AS400 /

                  iSeries

             <rpg400-l@midrang

                  e.com>

 

 






Not really.  When you consider that when RPG doesn't have an access
path, it has to read every record.

SQL _might_ have to do the same thing.  But the advantage SQL has over
RPG is that SQL can build a new access path on the fly from multiple
existing access paths.

HTH,

Charles Wilt
--
iSeries Systems Administrator / Developer
Mitsubishi Electric Automotive America
ph: 513-573-4343
fax: 513-398-1121


> -----Original Message-----
> From: rpg400-l-bounces@xxxxxxxxxxxx
> [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of
> Michael_Schutte@xxxxxxxxxxxx
> Sent: Thursday, March 30, 2006 4:22 PM
> To: RPG programming on the AS400 / iSeries
> Subject: RE: SQL Update in RPGLE.
>
> Except when SQL has to create the ACCESS PATH.  If there
> isn't an already
> defined access path, SQL will build one and then the length
> becomes longer.
>
> Michael Schutte
> Work 614-492-7419
> email  michael_schutte@xxxxxxxxxxxx
>
>
>
>
>              "Wilt, Charles"
>
>              <CWilt@xxxxxxxxxx
>
>              om>
>           To
>              Sent by:                  "RPG programming on
> the AS400 /
>              rpg400-l-bounces@         iSeries"
> <rpg400-l@xxxxxxxxxxxx>
>              midrange.com
>           cc
>
>
>
>      Subject
>              03/30/2006 04:14          RE: SQL Update in
> RPGLE.
>              PM
>
>
>
>
>
>              Please respond to
>
>               RPG programming
>
>               on the AS400 /
>
>                   iSeries
>
>              <rpg400-l@midrang
>
>                   e.com>
>
>
>
>
>
>
>
>
>
> RPGLE is not "definitely much faster" than SQL.
>
> RPGLE is faster when working one record at a time.  Once you start
> working with multiple records, then SQL moves ahead.
>
> HTH,
>
> Charles Wilt
> --
> iSeries Systems Administrator / Developer
> Mitsubishi Electric Automotive America
> ph: 513-573-4343
> fax: 513-398-1121
>
>
> > -----Original Message-----
> > From: rpg400-l-bounces@xxxxxxxxxxxx
> > [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Mike Troxclaire
> > Sent: Thursday, March 30, 2006 3:57 PM
> > To: rpg400-l@xxxxxxxxxxxx
> > Subject: RE: SQL Update in RPGLE.
> >
> > All the inputs are correct and I agree that there is no need
> > for SQL if only
> > one file is involved but I already have a ready made
> > complicated SQL query
> > so I wanted to go the SQL way. I agree that F specs were not
> > needed at all.
> > The update query ran just fine when I added "WITH NC" at the
> > end of the SQL
> > statement.
> >
> >   It would be very interesting to see some input on
> > performance when it
> > comes to SQL compared to RPGLE. RPGLE would definitely be
> > much faster but
> > just wondering by how much. I have atleast 12 files in my
> > UPDATE statement.
> >
> > Cheers,
> >
> > Mike.
> >
> > _________________________________________________________________
>
> --
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