Re: Pay attention when moving Data-Queues

At 11:24 AM 12/5/00 +0100, you wrote:

By definition, queue objects only have their object definitions, but not 
their contents saved.  Queue objects include output queues, job queues, 
message queues and data queues.

Although you think that the contents of a queue object (like an output 
queue) is kept in the queue object, you are incorrect, it is really 
contained in the QSPL library.  The job that owns the spooled object 
"points" to the member in QSPL.  Although this may seem illogical today, 
this made great performance sense in R01M01 of CPF.

If you keep data in a data queue (or any other queue object for that 
matter), you must "flush" the contents of the queue object to a data 
saveable object prior to the save, such as a physical file or a data area.

In recent times, IBM has stated their intention to "save" the contents of 
output queues in a future release.  It would be my guess that they would 
opt not to re-architect the entire queue design, but otherwise squirrel 
away the contents of the output queues as other vendors do.

Al
>Hello all,
>we made a move from one RISC-System to another.
>When restoring the complete system from a go save option 21 set of
>tapes, we started testing on the new system.
>The next day we took over only libraries that contained changed data
>from the (old) production system.
>What we did not think of was Data Queues !
>Is is difficult to restore the content o a *DTAQ object, its not
>impossible, but difficult ...
>So pay some attention to applications using data queues, either
>process the entries until the queue is empty or (like the programmer
>in my case did) there is a physical file as a copy of the entries
>in that queue for restoring the content in case something went wrong
>during processing.
>
>
>Regards from germany, Philipp Rusch
>
>
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