Patents by Inventor Wei M. Hu

Wei M. Hu 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).

  • Controlling data lag in a replicated computer system
    Patent number: 8838919
    Abstract: A method and system is provided for measuring, guaranteeing, and reducing replication data lag time between a primary system and one or more standby systems. Each standby system determines the lag time between the generation of a consistent version of data on the primary system and the time that the consistent version is applied on the standby system. Applications can request and be guaranteed to receive data from a standby system that is identical to the state on the primary system at the time of the query, or lag the primary state only by a maximum tolerable amount. A standby system may also publish a service that guarantees a maximum lag time and withdraw the service offer when the actual lag time exceeds the guaranteed lag time. Implications for implementing synchronous and asynchronous replication as well as performance optimizations are also discussed.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: September 16, 2014
    Assignee: Oracle International Corporation
    Inventors: Jia Shi, Wei M. Hu, Vinay H. Srihari, Yunrui Li, Mahesh B. Girkar, Benedicto E. Garin, Jr.
  • Controlling Data Lag in a Replicated Computer System
    Publication number: 20120054533
    Abstract: A method and system is provided for measuring, guaranteeing, and reducing replication data lag time between a primary system and one or more standby systems. Each standby system determines the lag time between the generation of a consistent version of data on the primary system and the time that the consistent version is applied on the standby system. Applications can request and be guaranteed to receive data from a standby system that is identical to the state on the primary system at the time of the query, or lag the primary state only by a maximum tolerable amount. A standby system may also publish a service that guarantees a maximum lag time and withdraw the service offer when the actual lag time exceeds the guaranteed lag time. Implications for implementing synchronous and asynchronous replication as well as performance optimizations are also discussed.
    Type: Application
    Filed: August 30, 2010
    Publication date: March 1, 2012
    Applicant: ORACLE INTERNATIONAL CORPORATION
    Inventors: Jia Shi, Wei M. Hu, Vinay H. Srihari, Yunrui Li, Mahesh B. Girkar, Benedicto E. Garin, JR.