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Using &NDB Verbs › Put It All Together—Unload or Reload an NDB › Unload Subsets Using Sparse Keys

Unload Subsets Using Sparse Keys

If an NDB contains disjoint record types, using keys on fields that are not in all records, you can unload just one record type by using one of those keys as the unload sequence. This can be useful for extracting subsets of the database.