On 5.5 pp4, when opeing a compatibility mode KSAM file for writing without updating - the key file modified date is changed - the data file date remains the same.
Just tried it

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From:   Gavin Scott
Sent:   Thursday, August 13, 1998 5:31 PM
To:     [log in to unmask]
Subject:        Re: CM KSAM/File System Bugs in 55 pp4? (long)

Craig after Patrick:
> > Now, under 5.5 pp4, the data file seems to get its modification date
> > changed only if the file is actually modified.

> Yes, this is true. In 5.5 the changes went in to change a file's
> modification timestamp only if it was truely modified.

Hmmm.  I thought the CM KSAM "KSAM Control" information (statistical
counts of access operations etc.) was kept in a user label on the
*data* file.  If this is true, then it sounds as though user label
changes are *not* causing the modification date to be updated, which
sounds like a fairly serious bug to me.  Or is the KSAM Control stuff
kept in the key file?

G.