RE: Fastest access: user space, data area, data queue

Thanks Tom.

That is the information that I need. 

Albert

----- Original Message -----
From: qsrvbas@xxxxxxxxxxxx
To: midrange-l@xxxxxxxxxxxx
Subject: RE: Fastest access: user space, data area, data queue
Date: Tue, 13 Jun 2006 18:09:06 -0400


Albert:

One thing to keep in mind about objects such as user spaces, user 
indexes and data queues, is that some of the normal checks aren't 
done. Locks, for example, aren't verified.

One job can ALCOBJ *EXCL, but another job can still access the 
object and update it without problem. Only when the second job 
actually executes ALCOBJ (or otherwise explicitly requests to 
establish or test for a lock) does that part of object access run 
for those objects.

That kind of processing is overhead when you consider an object 
such as a data area. Lock testing isn't so important when you're 
dealing with your own objects in QTEMP for example. IBM basically 
lets you run a little faster with a user space, but the risk goes 
up a little. It's up to YOU to make sure your access is appropriate.

In short, it means that accessing a user space can be faster than 
accessing a data area. And accessing a data queue for a message can 
be faster than accessing a normal message queue. Whether it's a 
meaningful difference is up to you.

Tom Liotta

midrange-l-request@xxxxxxxxxxxx wrote:

  7. Fastest access: user space, data area, data queue (Albert York)

I was wondering is there is any kind of significant difference in 
speed when accessing a user space, data area, or data queue 
entry. Thanks,

Albert

--
Tom Liotta
The PowerTech Group, Inc.
19426 68th Avenue South
Kent, WA 98032
Phone  253-872-7788 x313
Fax    253-872-7904
http://www.powertech.com


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