Hi,
I have a rather large dataset and I am adding 4 new fields. One of the fields needs to be initialized to N.
Can I do this through ADALOD and a user exit.
No. ADALOD adds or deletes records. It does not modify existing records. (Of course, you could unload, decompress, update the data records, recompress, reload, but I suspect that’s not what you were asking.)
It probably is easier just to do the ADADBS/NEWFIELD then run a program to to a READ PHYSICAL / UPDATE (with ET’s periodically).