How to run the same job in parallel

Jain Abhinav · New User Joined: 20 Dec 2007 Posts: 3 Location: India

Hi,

Please help me with the following situation.

I have a table which has 28 million records. There is a job which updates this table on a monthly basis. The problem is that the job runs for more than 12hrs. I need to optimise the run time for the jobs.

The scope of optimising the Db2 queries is minimal as confirmed by DBAs. I am thinking that if I can run the same job in parallel (may be 4 instances) and each instance updates around 7 million records. Thus instead of table lock, if I can have page locks on DB2 tables.

Has anybody done this in past.

TIA.

Abhinav Jain.

ascelepius · New User Joined: 16 Jun 2008 Posts: 35 Location: bangalore

Actually what matters here is if you have this data(28 mill records) in a partitioned table. Thus you can ensure that your batch programs run for pre-defined partitions on a monthly basis.

regards,
asci(i)

ksk · Posted: Wed Jul 02, 2008 4:47 pm Post subject:

You can partition the table and prepare 4 JObs. These 4 jobs have to be scheduled so that all will run same time and takes less time.

Rajkumar_n

It may be silly but I would like to know how we can run the same jobs at a time. At least the job names should be different even having the same functionality.

Srihari Gonugunta · Active User Joined: 14 Sep 2007 Posts: 186 Location: Pune

Also the jobs should be different as you are going to use four different input files.

ksk · Posted: Thu Jul 03, 2008 2:13 pm Post subject:

I have also faced the same situation and done as below.

We had more than 20 million records and divided it into 21 parts. Written a Procedure and written 21 JCLs for 21 different input files. This same procedure was called from each JCL by overriding input files accordingly.