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Data Collection Requirements
Over the years I’ve written emails with data collection requirements dozens of times, with varying degrees of clarity. It would be better, wouldn’t it, to write it once. I don’t think I can get out of the business of writing such emails entirely but here’s a goodly chunk of it. Another thing that struck me is that the value of some types of data has increased enormously... [More]
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Alternate Macro Libraries - Part 2
First, I’m indebted to Ray Mullins for his help in figuring out how to solve the problems I identified as remaining in Alternate Macro Libraries: A Way To Document Assembler Tables .
Indeed he wrote a very handy blog post of his own:
Wrapping your own macro code around vendor-supplied macros without changing source
This post, to summarise, shows how you can use the OPSYN instruction to create... [More]
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Flash Saviour Of The Universe?
When I first heard of Flash Express as part of the zEC12 announcement -
some time before announcement - I thought of one use case above all,
and one of particularly poignant resonance with some of my readers: Dump capture amelioration. Then, in the marketing materials, I heard of others.
And the discussions have grown more numerous recently.
So it’s time I expressed (pardon the pun) my... [More]
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DSECTs To DFSORT Symbols
It's said that imitation is the sincerest form of flattery. In this Social Media age I'd say indirection comes a pretty close second. Indeed there's a nice term for it: "link love". Standard advice is not to just post links to the content of others. In reality the word "just" should probably be inserted: Don't just post links to the content of others. In that vein I want to... [More]
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Square Roots In DFSORT
DFSORT's Arithmetic operators can do many things but the one thing they can't do is take the square root of a number. You might think that's minor but it means you can't calculate a Standard Deviation.
(Variance is fine but dimensionally not so nice when used in conjunction with the Mean.)
And I needed Standard Deviation in a real live customer situation. So I set out to "roll my... [More]
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Another Way Of Looking At CICS Monitor Trace Data
The CICS Monitor Trace SMF Record (Type 110) has got to be one of the most complicated SMF records in existence - and for good reason. Which is precisely why I'm not going to attempt to process the raw records in my code. (And why PMCICS doesn't support releases after a certain point.) But the "and for good reason" hints at the fact I think this is a tremendously valuable type of... [More]
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I Said "Parallelise Not "Paralyse" Part 4 - Implementation
Now with free map , this is the concluding part of a four part series on batch parallelisation, with especial focus on cloning. In previous parts I discussed: Motivation Classification Issues This part wraps up with thoughts on implementation. I'm going to break it down into: Analysis Making Changes Monitoring While there probably are iterations of this, this is the essential 1-2-3 sequence within... [More]
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BPXWUNIX - z/OS' Best Kept Secret?
Maybe you've all heard of BPXWUNIX. Maybe it's just me that hasn't. Hence the question mark in the title. Seriously, I doubt this REXX function is as widely known about as it should be. And this post hopes to illustrate a little of its value. Suppose you're writing a REXX program with a stem variable in it. Suppose you want to sort the strings in the stem variable: You might write your own... [More]
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Batch Capacity Planning, Part 2 - Memory
I can't believe it's been almost a week since I wrote Batch Capacity Planning, Part 1 - CPU . Where did the time go? Re-reading it I'm struck by the overwhelming theme of Batch's unpredictability and lumpiness. This is true of memory, as well, but to a much lesser degree. Why to a lesser degree? Well, in most systems I look at the memory usage is mostly fairly constant and dominated by big... [More]
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Multiline Message Sifting With DFSORT
Frank Yaeger of DFSORT Development suggested I pass this tip along to y'all. It's his solution to a problem set by Brian Peterson of UnitedHealth Group... In z/OS Release 12 two new messages were introduced: IEF032I and IEF033I replace IEF374I and IEF376I. The older messages were single-line step- and job-end messages. The new ones are their multiple-line analogues: IEF032I is 3 lines and... [More]
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Recent Experiences With Hardware Data Compression
As you probably know Hardware Data Compression has been supported by MVS
and IBM mainframes for around 20 years. In several recent batch studies
I've conducted it's been evident in a widespread way. (In
this post I'm not talking about DB2 compression of either flavour or
VSAM compression - though some of the information here applies to these
functions as well.) It's not as
simple... [More]
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Another (Perhaps Obvious) Reason For Avoiding Unnecessary Sorts
Following on from The Best Sort Is The One You Don't Do here's another reason for eliminating sorts. I think it's worth a post in its own right. (In this post, again, I'm talking about resequencing passes over data - not copying or merging.) With a sort it's possible the last record read in might be the first record written out. So you can never overlap input and output phases. (There might... [More]
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The Best Sort Is The One You Don't Do
Have you ever had the suspicion a sort was unnecessary in your batch? I bet you have. In recent Batch Performance studies I've had the suspicion that many of the sorts are unnecessary: Either they should be merges or not done at all. But how do you prove it? But first, what do I mean by a sort not needing to be done at all? Clearly if the data is reformatted then something has to be done to... [More]
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XML, XSLT and DFSORT, Part Three - Multiple XML Input Files
While I was putting together the original three posts in this series a number of thoughts struck me, amongst which two really cried out for further investigation: I don't know how your XML data arrives on z/OS but quite a lot of scenarios don't have the data all as one document (file). XSLT looks complex - particularly if recursion does your head in. Thought 2 I'll deal with in a... [More]
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XML, XSLT and DFSORT, Part Two - DFSORT
Following on from this post and this one , this post discusses the DFSORT piece. The DFSORT code in this post parses the Comma-Separated Variable (CSV) file produced by XSLT processing. In this simple example it merely produces a flat file report, but the post has a few additional details you might find valuable. First, here's the SORTIN DD JCL statement. It's not like a regular sequential file... [More]
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