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:
Aug. 18, 2020
Filed:
May. 24, 2012
Michiko Yoshida, Tokyo, JP;
Akira Shimizu, Tokyo, JP;
Seisuke Tokuda, Tokyo, JP;
Kazuhiko Mogi, Tokyo, JP;
Shinji Fujiwara, Tokyo, JP;
Nobuo Kawamura, Tokyo, JP;
Masaru Kitsuregawa, Tokyo, JP;
Kazuo Goda, Tokyo, JP;
Michiko Yoshida, Tokyo, JP;
Akira Shimizu, Tokyo, JP;
Seisuke Tokuda, Tokyo, JP;
Kazuhiko Mogi, Tokyo, JP;
Shinji Fujiwara, Tokyo, JP;
Nobuo Kawamura, Tokyo, JP;
Masaru Kitsuregawa, Tokyo, JP;
Kazuo Goda, Tokyo, JP;
HITACHI, LTD., Tokyo, JP;
THE UNIVERSITY OF TOKYO, Tokyo, JP;
Abstract
A database management system (DBMS) manages a database existing in a second storage device with an access speed lower than that of a first storage device. In an execution of a query, the DBMS dynamically generates tasks two or more executable tasks in parallel. The DBMS generates task start information which is information representing a content of the execution of the task, manages the task start information, and executes a content represented by the task start information by the task. The task start information includes a data address set existing in the second storage device. The DBMS controls movement of the data address sets between the first storage device and the second storage device based on a management state of the task start information. In addition, the DBMS selects the task start information based on whether or not the data address set exists in the first storage device.