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you can use IKJEFT01A or IKJEFT01B also
if u know any thing other than this send it to my mailid please

by using display statement write u r entire jcl and compile u r cobol program as usual and run it by using (INTRDR,...) like this
or
write u r entire jcl program in one ps...

u can use option P.3.2 in ispf panel to create the gdg

according to my knowledge, by using cond parameter or if clause we can do error handling and by using restart parameter we can start our job where we stopped last step

db2 will give more security than oracle because it is a subsystem and it will embeded with in the technology which we r using