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Highly reliable online system

  • US 5,307,481 A
  • Filed: 02/25/1991
  • Issued: 04/26/1994
  • Est. Priority Date: 02/28/1990
  • Status: Expired due to Term
First Claim
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1. A database management method for integrating a sub-database into a main database after said main database and said sub-database, initially having had the same contents, were separately updated by different contents wherein said main database and said sub-database are connected with a main online system and a sub-online system, respectively, comprising the steps of:

  • providing each database record with a main database update sequence number and a sub-database update sequence number wherein each sequence number represents a number incremented each time the database record is updated;

    transmitting database update information as well as both update sequence numbers from said sub-online system to said main online system wherein said update information and update sequence numbers are produced on the basis of the updated sub-database control;

    comparing each update sequence number attached with the transmitted information to examine whether the main database record and a corresponding sub-database record have been both updated or only the corresponding sub-database record has been updated; and

    ,updating the main database record by transmitted corresponding update information if only the corresponding sub-database records have been updated, while updating the main database record by reprocessing related input transactions keeping the update order of the database records if the main database record and the corresponding sub-database record have been both updated.

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