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Database management apparatus and query operation therefor, including processing plural database operation requests based on key range of hash code

  • US 6,556,988 B2
  • Filed: 03/16/2001
  • Issued: 04/29/2003
  • Est. Priority Date: 01/20/1993
  • Status: Expired due to Fees
First Claim
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1. A data management apparatus for indicating a data operation request to a plurality of data processors, said apparatus comprising:

  • means for analyzing an inputted retrieval request;

    means for generating a plurality of data operation requests based upon a key range of a hash code obtained by a hash function which is assigned in advance to a data operation key of said retrieval request;

    means for distributing the generated data operation requests to each of said data processors selected based on the analyzing result of said retrieval request;

    means for receiving the result of said data operation performed in each of the selected data processors, and outputted from each of said selected data processors; and

    means for merging the received result of the processes to said retrieval requests, and outputting the merged result.

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