Re: Question about SQL performance vs. RPGLE performance

David,

My question is: Why would you want to do that? RPG was designed to give
simple, efficient data base access.  The simplicity is in the way you
specify HOW things should be done through simple operation codes (or even
without operation codes, if you dare to use the cycle).  The efficiency is
achieved by opening every file once for every program.  SQL was designed to
give powerful data base access.  The power is in the way you specify WHAT
you want to be done, leaving the HOW to smart middleware (the optimizer).
To achieve this power, some efficiency had to be sacrificed.  All necessary
files have to be opened and closed for every action.  True, there are cases
where SQL is definitely quicker then RPG; true, IBM has worked hard to close
the gap between SQL and 'native' data base access.  But for single record
access RPG is a far more suitable tool than SQL.

Joep Beckeringh


----- Original Message -----
From: <dmosley@dancik.com>
To: <RPG400-L@midrange.com>
Sent: Monday, June 11, 2001 4:32 PM
Subject: Question about SQL performance vs. RPGLE performance


>
> I'm curious.  I've seen performance results of SQL vs RPG,  when using
> thousands of records.  But I'm just curious if there is a signifigant
> performance difference when accessing only one record.
>
> Heres my scenario :
>
> I've created a *SRVPGM program(with multiple procedure calls) that will
> access a database record, and do what ever with it.
> - Some of the Procedure calls are to @dspXX0003F, @addXX0003F,
> @dltXX0003FRrnDsp, @rtvXX0003FRrn, etc.....
> (XX0003F is the file name)
>
> And so what I've done rather than using CHAINS, EXCEPTS, WRITES, I've
> replaced them with embedded SQLs.  The performance appears to be the same,
> except for the first access, maybe a couple of seconds to prepare, but
> after that, it flies.
>
> This is all in test, and I was curious if anyone else performs database
> maintenance/access like this, and if so how's the performance.
>
>
> David L. Mosley, Jr.
> Systems Analyst
> 2000 CentreGreen Way
> Suite 250
> Cary, NC 27513



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