Re: RPG SQL and Cursors -- RPG400-L

Dieter,

What do you mean, you've never succeeded in optimizing job runtimes? Do you
mean you've never made a code change which speeds things up? I *know* that's
not true, because I've seen some of your code, and it's good stuff, and I
can't believe it got that way without you figuring out how to make it
good...

I write a lot of code which, like Dennis's code, is used in applications
where fractions of a second count. I've done a *lot* of work improving
performance, and it's paid off handsomely.

Rory

On Fri, Nov 19, 2010 at 9:06 AM, <dieter.bender@xxxxxxxxxxxx> wrote:

... it doesn't help to get microseconds at one end, throwing away seconds
or
even minutes at another end. Up to now, I've ever succeeded in optimizing
Job runtimes ...

D*B

--------------------------------------------------
From: "Dennis Lovelady" <iseries@xxxxxxxxxxxx>
Sent: Friday, November 19, 2010 5:14 PM
To: "'RPG programming on the IBM i / System i'" <rpg400-l@xxxxxxxxxxxx>
Subject: RE: RPG SQL and Cursors

That's cute and I look forward to writing such a note a few/several years
from now.

It's all relative. Microseconds may not matter in your business; heaven
knows most System i are not exposed to high transaction volumes per unit
of
time.

If, however, you design your applications to be used by several thousand
users concurrently, those microseconds shall add up. It will matter. It
does matter. Of course you have the option of never applying for a job

at

a
place that does that sort of business.

Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
Change is inevitable, except from a vending machine.

A little off-topic...

Some years ago Tracy Kidder wrote a wonderful book, "The Soul of a New
Machine", regarding the efforts of Data General's computer engineers in
building of their first minicomputers. In that chronicle, of of the
engineers charged with writing the computer's microcode got tired of
working
with oscilloscopes and nanoseconds and, I quote,

*"He went away from the basement and left this note on his terminal:
"I'm
going to a commune in Vermont and will deal with no unit of time
shorter
than a season." "*

Dieter, believe me, I really understand and share your sentiments...

Best Regards,

Luis Rodriguez
IBM Certified Systems Expert - eServer i5 iSeries
--

On Fri, Nov 19, 2010 at 10:43 AM, <dieter.bender@xxxxxxxxxxxx> wrote:

... I wouldn't use a mix of RLA and SQL, but maybe thats a question

of

flavour and I'm tired of discussions about microseconds.

Dieter

--------------------------------------------------
From: "Aaron Bartell" <aaronbartell@xxxxxxxxx>
Sent: Friday, November 19, 2010 3:40 PM
To: "RPG programming on the IBM i / System i" <rpg400-l@xxxxxxxxxxxx>
Subject: Re: RPG SQL and Cursors

I use a balance of RLA and SQL. Usually use RLA by default and

only go

to

SQL when it is a better fit (i.e. dynamic sorts, searches, ranges,

etc).

We
are actively moving our web development (i.e. OpenRPGUI.com) from

our

V5R3

server to our V6R1 server so I am planning on jumping into free

form

embedded SQL, and on that note...

Are there any well documented (i.e. articles) out there that show

how a

CRUD
application would use embedded SQL for all file access? I ask not

because

I
am new to SQL, but because I am not yet convinced of how it's usage

is

being
described by some in this thread.

I must say that Alan's comments about lessening the compile burden

is

something I hadn't considered to a great extent until I started

thinking

about it. Certainly better that wrapping file access with

*SRVPGM's

where

the whole record is being passed in/out without applying any sort

of

business logic. I think this also comes down to having a good

change

management solution that does a lot of the work for you (as it

should).

Aaron Bartell
www.MowYourLawn.com/blog
www.OpenRPGUI.com
www.SoftwareSavesLives.com
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