concrete, non - volatile, computerlesbares medium that is encoded with instructions, the one or more processors to the execution of information cause, including: reacting to a question that perform a shuffle operation on a datenstream and shuffle - o peration operation.the data sets with key values in the datenstream according to key values grouped: the reception of at least a part of the datenstreams,with the datenstream a variety of records and each record contains a key value and the datenstream by one or more sale is received; storing the number of data records in a nonvolatile storage location from a set of non-volatile storage locations neach non-volatile storage location a key according to the key values in the range of data records is assigned to and the non-volatile storage location for each record, at least in part, on the basis of the schlu00fcsselwerts of each record is selected. receiving a request from a consumer for a unterset from the wide range of records, including egga key area; and the consumer's request, provide the untersets from the wide range of records, including the key areas of one or more of the nonvolatile storage locations.
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