What does the KEYRANGES parameter in Define Cluster commend do?

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What does the KEYRANGES parameter in Define Cluster commend do?..

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It divides a large dataset into several volumes according to
the Key ranges specified. e.g., KEYRANGES ((0000001 299999
(3000000 599999). if the activity on the key ranges are
evenly distributed, concurrent access is possible, which is
a performance improvement.

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