Patents Examined by Debra A. Chien
  • Data availability in restartable data base system
    Patent number: 5155678
    Abstract: A method for maintaining switchover between a backup and degrading active processor, which switchover is transparent to a terminal accessing the active processor with atomic transactions. The backup processor prepares for an outage by the active processor by synchronizing, tracking, and monitoring the active processor's log entries. When the active processor fails, the backup processor performs the necessary recovery processing and takes over user-transactions processing as the new active processor.
    Type: Grant
    Filed: October 29, 1985
    Date of Patent: October 13, 1992
    Assignee: International Business Machines Corporation
    Inventors: Takeshi Fukumoto, Takayuki Funahasi, Harrison Scofield, Terrence E. Walker, James W. Young, Jr.