MVSFORUMS.com

ramu_mohan21

Hi Board,
I want to get clarified about some information which I knew about BMP, DL/I and MPP.

If we use DL/I mode the database can't be accessed by ONLINE transacation when Batch JOB is updating the same database.

If we use BMP mode the ONLINE transaction can also access the database when Batch JOB is updating the same database.

In our system there are two BMP Jobs are updating the same database. But when both the jobs are updating at the same time they were abended with U0850(Contention).

What I understood here is BMP mode will be helpful when Batch and Online accessing the dabase at the same time(But even DL/I mode will not support this facility).

But this BMP mode can't be helpful when Both Batch Jobs are updating at the same time. I think my assumptions are right. Anyone can support.

PS: Information regarding BMP, DL/I and MPP is available in this forum in different questions. But I need clairification in perspecitve of Online and Batch.
_________________
Best Regards,
----------------
Rammohan Pabba
Software Engineer

deepeshk79 · Posted: Wed Dec 29, 2004 2:47 am Post subject:

Hi Rammohan,

BMP mode is useful when both Batch Jobs are updating the same database. It infact depends on how we have designed our system. The Contention abends can be avoided by proper design or change in scheduling pattern. Though BMP modes are designed to access databases both online and batch, it is still effective for two batch jobs accessing at the same time.

Regards,
Deepesh

ramu_mohan21 · Posted: Wed Dec 29, 2004 5:16 am Post subject:

Hi Deepesh,
Thank you for your reply.

Bithead · Posted: Fri Dec 31, 2004 11:47 am Post subject:

Look into "Block Level Sharing". It may help run BMP and DL/I together.

ramu_mohan21 · Posted: Sun Jan 02, 2005 4:12 am Post subject:

Hi Bithead,
Thank you very much for reply. I will try to get more information about "Block Level Sharing".

Best Regards,
_________________
Best Regards,
----------------
Rammohan Pabba
Software Engineer

icon · Beginner Joined: 10 Jun 2003 Posts: 5 Topics: 2

My question is needing further clarification regarding BMP and DL/I. What is the major pros and cons of designing the programs in each mode? Any advantages in terms of checkpoint restarting, recovery, resource/CPU usage?

In the previous company I worked for all the programs are BMP and there is almost zero db downtime. In my current post, there is a mix and they are slowly converting the DL/Is to BMPs. I do not believe data contention is an issue in this shop. Is converting to BMPs the right way to go?