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Replication tracking method and apparatus for a distributed data processing system

  • US 6,253,211 B1
  • Filed: 05/28/1998
  • Issued: 06/26/2001
  • Est. Priority Date: 07/26/1997
  • Status: Expired due to Fees
First Claim
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1. Replication tracking apparatus for tracking, between replications, an amount of synchronization of data in a distributed data processing system having plural application server computer systems interconnected via a network, each application server having a database application having a database and means for communicating data from the database via the network to plural client computer systems and to others of the application servers, the apparatus comprising:

  • means for generating an event message upon detection that copies of the database on different application servers are out of synchronization by a predetermined amount, said means for generating comprising;

    sampling means for sampling each copy of the database;

    first comparison means for determining whether corresponding samples match each other and for counting results thereof; and

    second comparison means for generating said event message if a number of matches counted by said first comparison means is less than an acceptance threshold representative of said predetermined amount of synchronization.

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