Patents by Inventor T. K. Rengarajan

T. K. Rengarajan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and system for decreasing recovery time for failed atomic transactions by keeping copies of altered control structures in main memory
    Patent number: 5414840
    Abstract: Fast recovery from process terminations during atomic database transactions is accomplished by maintaining global memory after process terminations. Database data stored in global memory is accessed through control data structures. Control data structures are updated within atomic transactions that maintain structure consistency. Should a process fail during an atomic transaction that is updating control data structures, consistency is maintained by recovering the control data structures to their initial state existing immediately prior to the atomic transaction. Transactions involving control data structures are journaled as before-images in a log located in global memory. After a process failure, the before-images are installed to return the control data structures to the consistent state existing before the process failure.
    Type: Grant
    Filed: June 25, 1992
    Date of Patent: May 9, 1995
    Assignee: Digital Equipment Corporation
    Inventors: T. K. Rengarajan, Peter Spiro, Anath Raghavan, David B. Lomet