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What is RECOVERY and SPEED parameters in DEFINE

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What is RECOVERY and SPEED parameters in DEFINE CLUSTER command ?

RECOVERY (default ) and SPEED are mutually exclusive. Recovery performats the control areas during the initial dataset load, if the job fails, you can restatt but you must have a recovery routine already written to restart the job. SPEED does not preformat the CAs. It is recommended that you specify SPEED to speed up your initial data load.

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