How Commit works?

Hello all,

A question:

We are having some problem running a JOB. The job is taking too much time to finish. However at end the Commit occurs.

Let´s suppose:

We are running a Program (in BACKEND) that updates a table

The Backend process has not finished (meaning: commit does not happen yet).

At same time, in a FRONTEND (portal), user is doing changes that affect the same program above.

The question is:

At the moment user makes the change(s), can this change occurs in the Backend process which is running?

Perhaps the question should be:

“The entry(ies) in the Backend Process is LOCK when program is running? Then in this case if user makes a change in Frontend the change is not gonna happen in the Backend process? “

Can someone help me out to understand this process.

Thanks in advance!

Regards,

Barbara