Patents by Inventor Conrad Kwok-Wai Tang

Conrad Kwok-Wai Tang 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).

  • Publication number: 20200175016
    Abstract: Multiple cost models (e.g., a sub-operations costing model and logical-operations costing model) can be used to make cost estimations of execution of database queries in one and each one of the multiple heterogeneous database systems. As a result, a “hybrid” cost estimating mode can be used whereby two or more cost models can be used in a single database system in to order maximize the advantages and minimize the disadvantages of each of the cost models, thereby striving to achieve an optimal balance. In addition, cost estimation can be switched between a hybrid cost estimating mode and a single cost estimating mode. The switch can, for example, be made as a part of tuning phase, as more information about actual costs of execution of database queries becomes more available, or as a result of changes to the database system and/or it operations, and so on. As a result, a flexible cost estimating mechanism can also be provided.
    Type: Application
    Filed: December 19, 2018
    Publication date: June 4, 2020
    Applicant: Teradata US, Inc.
    Inventors: Sanjay Nair, Sreyas Srimath Tirumala, Nurjahan Begum, Chandana Prakash, Mohammed Al-Kateb, Conrad Kwok-Wai Tang, Mohamed Yassin Eltabakh, Kassem Awada, Grace Kwan-On Au