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As each job is executed (batch as well as interactive jobs), they
allocate and use the space required to perform their tasks. Objects that
are created, programs that are executed and held in memory (such as
returning without setting on *InLr), temporary files created in QTEMP
and other system objects are held with the job. If the system doesn't
actually require them during the current process, the system will move
them out to DASD. This is probably what is spiking your DASD during the
day. Signing off and back on, cleaning up old spooled files, clearing
QRPLOBJ and other simple steps can be used to help you out.
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