Using a compressed copy without expansion
If the utility is performing the Copy Image Copy function and is using a compressed image copy as input, the utility can perform a physical copy without expanding the data.
Bypassing the expansion of the data can save a significant amount of time and resources.
The ASIS keyword controls whether the data is expanded during the Copy Image Copy function.
To request that the utility use a compressed copy with expansion, specify ASIS(Y) on a valid control statement or in an options module.
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