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IMAGECOPY support: LOAD PART to support STACK YES like REORG PART
For the subject image copy behavior in the LOAD utility, it is as the customer describes:
COPYDDN can be specified at the job / table space level but requires the RESUME or REPLACE keywords at the table space level, so this would effectively results in a table space level serialized LOAD where concurrent LOAD PART jobs cannot be run.
COPYDDN can alternatively be provided at the INTO TABLE PART level, but it is required for each INTO TABLE PART statement and hence a separate image copy data set is required on each partition being loaded
STACK YES on a COPYDDN TEMPLATE is not a possible option on the LOAD utility. Similar to REORG, the LOAD utility needs to allocate and to open/populate all the target image copy data sets at the same time while it is running in the RELOAD phase. So with STACK YES LOAD can only operate on a single image copy data set a time.
We believe what is really needs, is for LOAD PART to behave similarly like the REORG PART utility, where the utility can allocate a single inline image copy data set on a multi-part LOAD, and enable that single image copy data set to contain the pages from all target partitions loaded. That way, each LOAD PART job would only use up one tape drive, and customer can still exploit running concurrent LOAD PARTs to further reduce elapsed time (assuming there are no NPIs in the table being loaded).
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