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VSAM - What is RECOVERY and SPEED parameters in DEFINE CLUSTER command?




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asked mar August 7, 2014 12:23 PM  

What is RECOVERY and SPEED parameters in DEFINE CLUSTER command?


           

1 Answers



 
answered By Mswami   0  

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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