Patents by Inventor Kazuaki Masamoto

Kazuaki Masamoto 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 apparatus for database update/recovery
    Patent number: 5043871
    Abstract: There are provided a backup version page table in a storage for providing a correspondence between the pages of a database and the slots in a database storage medium in which the contents of pages to be recovered, if necessary, are stored; a current version page table for providing a correspondence between pages updated by a transaction and slots in the database storage medium wherein the updated contents of the pages are stored; and a journal file for recording various system journals; wherein the updated page contents are stored in the database stored medium at the slots not-used at that time and found with reference to the backup version page table and the current version page table.
    Type: Grant
    Filed: March 26, 1987
    Date of Patent: August 27, 1991
    Assignee: Hitachi, Ltd.
    Inventors: Toru Nishigaki, Sadasaburo Kanai, Kazuaki Masamoto