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Vinay,

I've been following this thread.
One of the simplest methods is to NOT set on LR when exiting the program, This leaves all files open for next call.
We use this procedure often batch programs.
Many good articles related to LR.
Search "RPG LR" and/or "RPGLE LR"

http://www.mcpressonline.com/programming/rpg/practical-rpg-activation-groups-and-*inlr.html


<For every file, it does an OVRDBF of FILEA to the actual file name, Opens the file, updates/writes the record, and then Closes the File.

The implementation is slightly different depending if RPG or RPGLE.

Paul

-----Original Message-----
From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Vinay Gavankar
Sent: Friday, December 11, 2015 6:43 PM
To: RPG programming on the IBM i (AS/400 and iSeries)
Subject: Need ideas to reduce open/close in RPG program

Hi,

We have a program which receives some values thru Data Queue read and it updates a file with the values received.

The problem is that there are multiple copies of the file it needs to update.

Let us say it is updating FILEA, so that is what is in the compiled code.

On the system there are currently 15 files which are exact copies of this file. They have a different file name, but the the same record format name, field names etc.

The program reads a 'control' file, which has the names of these 15 files.
For every file, it does an OVRDBF of FILEA to the actual file name, Opens the file, updates/writes the record, and then Closes the File.

The system was built for 'flexibility' years back, when they started with 2 or 3 files. It is flexible, in the sense it did not need a code change as the files being updated grew from 3 to 15.

This is a very 'busy' program, meaning it is constantly receiving data thru the data queue. Actually there are multiple copies of this program running simultaneously receiving data from the same data queue and all of them are pretty busy.

Now they are finding that all these open/closes are seriously impacting the CPU usage.

An architectural change is obviously indicated, but that would take time to implement.

As usual, they are looking for a 'short term', quick and dirty fix (to be implemented in 2 weeks) to eliminate these open/close.

The only thing we could think of was to define the current 15 files separately in the program and then update them as needed, losing all flexibility.

Any other ideas or suggestions would be greatly appreciated.

TIA
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