I don’t believe there is any canned report of that information.
The system does, however, keep track of when an object was last changed and this information is available to you via commands such as DSPOBJD with DETAIL(*FULL) and APIs such as List Objects (QUSLOBJ). You could then determine what objects changed on the current day and add up their sizes. I’m not sure why you would want to do this however. Changing 100 records in a file with 15000000 records would have the listing reflecting the size of the 15000000 records for instance.
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