At 09:49 +0800 on 08/27/2006, Johnny Luo wrote about Re: Z/os
Performance issue: REWRITE a sequential data set:
So i think the problem is just what Robert said : QSAM and BSAM.
Score one for me <g>. It was just a SWAG (Scientific/Stupid Wild Ass
Guess) analysis on my part. Sometimes you just hit on the right
answer just from the symptoms for no other reason.
I'd be interested in follow-up (just for my own information) once you
verify if I was right or not.
If you want to check on if QSAM or BSAM is in use, just take a System
Dump while the program is running and look at the DCB in the dump.
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