Use of any system exit increases system overhead. Use of the CSVFETCH exit is no different. Further, the addition of the "first" exit routine for a system exit may have more increased overhead than the addition of the "N+1" exit routine. One reason for that is that the system can avoid creating the parameter data for the exit and can avoid calling the dynamic exits service for a CALL request if it knows that there are no exit routines. AFAIK, IBM makes no attempt generally to quantify the impact. Your mileage may vary. Peter Relsonz/OS Core Technology Design (retired)
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