The DUMP is an option in the PGM ADRDSSU(DFDSS).
Lets say I have two JOBS A & B and a VSAM file 'CALENDAR FILE'.
Job A open Calendar file for dumping into a tape dataset.
At the same moment JOB B opens the Calendar file in Read mode.
I find that the shareoption of the calendar file is defined as (1,3) (multi-reader), but still the JOB B fails due to file contention issue ( Since JOB A holds the file for Dumping)
Is there any specific reason for that ?