Lindy Mayfield wrote:
Thanks all for the clarification. This is a synopsis up what I learned,
which was sort of what I thought:
- Regular "record oriented" PS files can updated by basically opening
them for I/O and replacing a particular record. They still have to be
sequentially scanned of course. COBOL and EXECIO can both do this.
- A FBS PS dataset can be updated at any byte location (like an ESDS or
even LDS) using lower level routines provided by Assembler, IBM C and
SAS/C. AMASPZAP could also be used. If you write your own access
method you can even do random access I/O operations.
- Still, though, when you get down to it, it is still QSAM and
multi-user access (without some sort of higher level manager) would
solely depend on ENQ, which, if I'm not wrong, would be pretty lame.
- And finally, if it is an application programmer type asking, the
answer is just plain No. (-:
That's a terrible attitude! If the application calls for it,
why would you lie to the application programmer? Honestly,
systems programmers can sometimes be so arrogant!
Regards,
Lindy
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of john gilmore
Sent: 20. elokuuta 2007 16:30
To: [email protected]
Subject: Re: ways to update PS files?
As usual, we have a lot of people posting comments about things they
know
little about.
NOTE and POINT, as reference to the current z/OS DFSMS Macro
Instructions
for Data Sets manual will confirm, are usable only with BSAM and BPAM.
And GET / PUTX only usable with QSAM. So what?
Much depends upon what kinds of update processing are required, in
particular upon whether non-sequential processing is required.
John Gilmore
Ashland, MA 01721-1817
USA
--
Kind regards,
-Steve Comstock
The Trainer's Friend, Inc.
303-393-8716
http://www.trainersfriend.com
z/OS Application development made easier
* Our classes include
+ How things work
+ Programming examples with realistic applications
+ Starter / skeleton code
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+ Tips and techniques
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