I did some testing and discovered the following for user spaces:

-- If you obtain a space pointer via the QUSPTRUS API or resolve the system pointer and then set a space pointer from that system pointer and then directly read data from the user space or write data to the user space, the usage information is NOT updated.
-- If you use the QUSRTVUS API to read data from the user space, the usage information IS updated.
-- If you use the QUSCHGUS API to change data in the user space, the usage information is NOT updated.

So, the last one, changing the user space via the API, behaves just like the CHGDTAARA command; it doesn't update the usage information.

You should notice that in IBM's usage documentation that user spaces aren't mentioned.

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Ken Sims
Sent: Thursday, November 01, 2012 07:26
To: midrange-l@xxxxxxxxxxxx
Subject: Re: Object use vs. library use

Hi Robert -

On Thu, 1 Nov 2012 09:29:06 +0000, Robert Houts <rshouts@xxxxxxxxx>

Simply resolving a pointer to an object does not cause the last used date to be updated. For example, the RTVDTAARA command and QWCRDTAA API both cause the last used date of a data area to be updated. But, (inexplicably) the CHGDTAARA command does not. In all three cases the pointer is resolved. You can resolve pointers all day long to any objects, but the usage information is only updated when you actually use the object.

The last used date for a program is updated when a program is run (or activated). As with all objects whose usage information is tracked, it is only updated the first time it is used in a given day. It has nothing to do with whether the calling program has been running for several days or just a few microseconds. If a program that runs for multiple days calls another program each of those days, the called program's usage information will be updated each day that it is called.

So for something like a user space that is being read and/or updated by use of a pointer (rather than the user space APIs), at what point does the system update the last-used date?

Opinions expressed are my own and do not necessarily represent the views of my employer or anyone in their right mind.

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