You should pass CHECKpoint frequency value from JCL to

cobol program.Intern cobol program will have the table of

retart logic.

Table contents(coloumns)be: 1.No of records ,2.No of

records + 1, 3.no of records processed etc.

Once the updattion or insertion got stucked while

processing ,All the relative data will be stored the above

mentioned table.

So check the record from table .Fix the abend and restart

your job for the failed step.

This is mainly production support work .manually u have to

check the record .and get the records info from the table

and restart the job from the failed step