Concentrator handles an entire file at a time when it is being transferred to a Control Center, and Control Center handles an entire file both when receiving from Concentrator and when processing into a database.
With very large z/OS datasets or if a number of them are being handled at once this can cause either or both components to fail with 'out of memory' issues.
If you are using a Concentrator to move data from your system to a cloud machine, or simply wish to break up files into smaller pieces for onward transmission, you may wish to look at using the SPLIT facility.
ACQPUSH can split up a z/OS dataset and generate a set of commands for copying each part. The commands can be anything you like as detailed below.