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Multipoint database synchronization protocol to avoid data corruption

  • US 6,393,419 B1
  • Filed: 12/09/1999
  • Issued: 05/21/2002
  • Est. Priority Date: 02/08/1999
  • Status: Expired due to Term
First Claim
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1. A multi-client database synchronization method for avoiding data corruption, the method comprising the steps of:

  • contacting a database manager by a first client seeking to access a database record;

    allowing the first client access to the database record by the database manager;

    storing a change counter value by the database manager upon the first client accessing the database record, the change counter value being a first value which corresponds to the state of the database when the first client accessed the database record;

    saving a modified version of the database record having modifications made by a second client after the first client accessed the database record;

    incrementing the change counter value to a value of other than the first value in response to the second client saving the modified version of the database record;

    seeking to save the database record by the first client; and

    denying the first client from saving the database record by the database manager upon determining the change counter value has been incremented from the first value.

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