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Status Future consideration
Workspace CICS Transaction Server for z/OS
Categories Runtime
Created by Guest
Created on Feb 14, 2022

RELATED IDEAS

CICS statistics fields sometimes turn negative or don't make sense

One of the fields this problem happens to is Storage Manager: Dynamic Storage Areas Statistics field SMSGMREQ ( Getmain Requests ). By common sense, this field should never be negative.

But the Cobol version of DFHSMSDS defines this field as signed:

PICTURE S9(8) USAGE IS COMPUTATIONAL

As the 4-byte native field that holds the number of getmains for a DSA increments from x'7FFFFFFF' to x'80000000' and beyond, products and programs that interpret this number report negative, or weird, and different results.

For instance, take the following raw field x'A08AC7CB'. The table below shows that raw field interpreted as unsigned, as signed, and it shows how different IBM programs and products interpret it.

Unsigned: 2,693,449,675
Signed: -1,601,517,621
DFHSTUP: 1517621
WUI: -1,601,517,621
CICSPA: -160151762
DFH0STAT: 1,601,517,621

You can see that each of these different products/programs has a different interpretation of the same raw field!

The ask for this requirement is that all statistics fields be defined as unsigned fields so that they will never be interpreted as negative, and that all statistics fields are sufficiently large such that they will never wrap back around to 0 before being reset.

Idea priority High
  • Guest
    Reply
    |     Mar 2, 2022

    This is a candidate for a future release

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