Quote:
Originally Posted by KFC911
Maybe y'all were running VSAM on tiny blue boxes  ?
I could tune a VSAM cluster that housed all of my humongous data bases, on hardware that only the very largest had ... like the biggliest.
I can fish 
VSAM ... meh...
VTAM ...  |
We needed to update from multiple address spaces without a CICS FOR. OLTP system didn't run CICS and we weren't rewriting to give big blue more $. The setup we wrote was similar to VSAM - but with a multi-layer CI and TI in memory and backwards pointers so you could do reverse order sequential reads. It replaced a system that replicated the an index on track 0 of each cylinder to reduce the seek time - that's how old it was.
And don't get me started on VTAM...
I still have the memory scars from switching to binary transfer and doing unsolicited writes to speed up data transfer to our
VB apps with their own 3270 emulator. LZW compression for the win...