Re: Trigger Program Question

Then convert to using a User Space and all is well.

Really simple change. Just add the BASED() keyword to the DS (or field) definition currently being used and add logic to run during initialization to obtain the pointer.

That said - given the criteria you are stating I see no reason not to simply condition your current IN operations to only retrieve the data area on first usage.

On Nov 13, 2019, at 11:55 AM, Vinay Gavankar <vinaygav@xxxxxxxxx> wrote:

Just to clarify, the Trigger program does not lock or update the data
areas. The data areas have values like the Data Queue name, Library and
some other control flags. They COULD be updated manually by a user in some
extreme condition, but I haven't really know of an instance when that has
been done in the last 10 years. The data areas have different values based
on production machine or different test environments, but given the machine
and environment, they are pretty much static.

On Wed, Nov 13, 2019 at 11:32 AM Jon Paris <jon.paris@xxxxxxxxxxxxxx> wrote:

If the IN operation is really the problem then an alternative option is to
use User Spaces to replace the data areas.

Because they can be resolved via a pointer they are just like any other
memory in the program and require no operation to "see" the current data.
If there is potential for more than one program to update the space then
you might want to implement some "in use" semaphore to ensure that the
updates don't screw each other up.

On Nov 13, 2019, at 9:15 AM, Vinay Gavankar <vinaygav@xxxxxxxxx> wrote:

We have the same Trigger Program (in RPGLE) defined on multiple files,
which get updated from multiple different jobs. The program writes an

entry

to a data queue. The total updates to all the files easily exceed a

billion

a day.

I have a few questions. How is the program invoked on file update? Does

it

always get a fresh copy? If not, is it possible to code something which
will execute only once?

What I am trying to do is this: The program is reading 4 data areas using
'IN' statement. I have found that the IN statement is about 7-8 times

more

'expensive' than CHAIN. I am trying to figure out if there is a way to
increase the efficiency of the Trigger program. All the 4 data areas are
really static, but CAN be changed, hence the 'IN' statement for every

cycle.

Any ideas will be greatly appreciated.

Vinay
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