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Storage Use

CA Compress uses storage in the user's address space and the Common Area (CSA/SQA).

In the Common Area, CA Compress uses about 204 KB. Of this amount, 79 KB is stored below the 16 MB line.

At initialization, the SHRKRES option requires an extra 17 KB below the line while giving corresponding relief to each user address space invoking CA Compress. The amount of storage used in the subsystem address space is about 30 KB, but can vary, based on OPEN activity.

To prevent excessive I/O against the Control File, the contents of the Control File are retrieved from auxiliary storage and retained within the CA Compress address space. The table created can increase the REGION needed by the CA Compress address space. As a rule, the information for each 100 data sets requires an additional 20 KB.