The SPEED / RECOVERY parameters are used to specify whether or not VSAM should pre-format the space allocated to the cluster as part of the DEFINE process. Specifying RECOVERY (the default) causes the allocated space to be filled with end-of-file markers. If the initial load of the cluster with data should fail before completion, the end-of-file markers can be used to resume the load from the point of failure. For large datasets, this can save recovery time, however there is a trade-off in time to write the end-of-file markers during the definition of the cluster.
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