RE: Checking for dupe key on WRITE

Eric,

I totally understand that. My view (and experience) is 99.9999% of the time
the pre-check is necessary/more important. In fact, I'd do it 100% of the
time, and use the error catch less often. I really can't remember the last
time I got a duplicate write error when doing a pre-check. If I did,
though, I'd almost want a hard halt to try and figure out why it happened.


Bradley V. Stone
BVSTools - www.bvstools.com
eRPG SDK - www.erpgsdk.com

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]On Behalf Of DeLong, Eric
Sent: Wednesday, January 09, 2008 5:10 PM
To: RPG programming on the AS400 / iSeries
Subject: RE: Checking for dupe key on WRITE


Brad,

The suggestion is not that you simply don't handle the
exception.... That would be stupid.... The suggestion is, for
cases where exceptions are infrequent, to handle the exceptions
via monitor (exception handler). In other cases, the pre-check
code might be more efficient.

Its a design choice.

Eric

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]On Behalf Of Bradley V. Stone
Sent: Wednesday, January 09, 2008 4:48 PM
To: RPG programming on the AS400 / iSeries
Subject: RE: Checking for dupe key on WRITE


And if there is, and you didn't check for it and/or monitor for
you, you're
spending lots of time answering phonecalls! :)

cpu cycles for a pre-check are the least of my wories.

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]On Behalf Of DeLong, Eric
Sent: Wednesday, January 09, 2008 4:46 PM
To: RPG programming on the AS400 / iSeries
Subject: RE: Checking for dupe key on WRITE


Only if there is an actual collision.... If no collision, then
the pre-check on every write would be 100% wasted time....

Eric

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]On Behalf Of James Lampert
Sent: Wednesday, January 09, 2008 4:42 PM
To: RPG programming on the AS400 / iSeries
Subject: Re: Checking for dupe key on WRITE


Bradley V. Stone wrote:

In a worst case scenario, yes. But that doesn't mean you

should only use

the duplicate key error and NOT check for existance before

blindly writing a

record.

Indeed. A key collision uses up significantly more system time and
resources than pre-checking.



--
James H. H. Lampert
Touchtone Corporation

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