How Commitment and Roll back control is used in as400, explain with real time s

How Commitment and Roll back control is used in as400,
explain with real time senario ???

Question Posted / naveen

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How Commitment and Roll back control is used in as400, explain with real time senario ???..

Answer / avinash

suppose we have to update 1000 of recrds in my cobol db2
program and my program is running fine and it has updated
999 records but the job gets abended in this scenario my
work is not commited or completed so again i have to submit
a job and again it starts updating from record 1.

so to avoid such scenario commit and rollback is used.
so if we set commit point at every 200 records then it will
update the records in 200*5=1000
so if job abends on 999 records then it rooback to the
records from 800 to 1000.
so cpu time will be less.

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How Commitment and Roll back control is used in as400, explain with real time senario ???..

Answer / garry

With commit/rollback we can ensure data consistency.

Consider a scearion where commit/rollback is not used.
Suppose your program writes/updates 10 files. In case the
program fails in between (say after updating 5 files),
there will be data in 5 files and corresponding data will
not be available in 5 files.

If we introduce commit/rollback in above program. In case
of program failure changes made to 5 files can be rolled
back so that we don't have inconsistency between files.

with Commit/rollback we can ensure either all files are
updated or not file is updated.

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