The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 24, 2002
Filed:
Sep. 09, 1999
Yuri J. Breitbart, Scotch Plains, NJ (US);
Raghavan V. Komondoor, Madison, WI (US);
Rajeev Rastogi, New Providence, NJ (US);
Srinivasan Seshadri, Basking Ridge, NJ (US);
Abraham Silberschatz, Warren, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
A system for, and method of, ensuring serialization of updates from a replica site in a distributed database that is described by a copy graph and a distributed database incorporating the system or the method. In one embodiment, the system includes: (1) a directed acyclic copy graph (DAG) creation module that identifies backedges in, and removes the backedges from, the copy graph to yield a DAG and (2) a propagation module, associated with the DAG creation module, that initially employs eager updating to propagate the updates along the backedges and thereafter employs lazy updating to propagate the updates along edges of the directed acyclic copy graph to ensure the serialization.