On Mon, 16 Nov 2020 10:23:57 -0800, Charles Mills wrote:

>SMF Type 42 subtypes 20 and/or 21 will give you that information: 21 for
>straight member delete, and 20 for PDSE directory re-initialize. I don't
>think type 17 is relevant to this problem.
>
>Be aware that it is possible for a malicious programmer to defeat it: if a
>program opens a PDS as a BSAM dataset and manipulates the directory directly
>that will not be reflected in SMF Type 42, although SMF 15 would show that a
>PDS was closed for xSAM output -- and there would be no corresponding SMF
>Type 42. Although I suppose it might be possible to defeat that check also.
> 
Is PDSE more robust?  I believe one can open a PDSE as a BSAM data set and
read but not write the directory directly (it fakes it?)  And IBM provides some
security-by-obscurity by concealing PDSE details (except for a high price).

-- gil

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