Hitachi, Ltd.

The University of Tokyo

Taro Fujimoto

Akira Shimizu

Masaru Kitsuregawa

Kazuo Goda

Yuto Hayamizu

Takuya Isozaki

A database management system (DBMS) performs, in response to a conversion request to convert a store format of a table in a database, a process (base type change process) for changing a store format indicated by information (base type) indicating the store format of the table to a store format according to the conversion request, and performs a data conversion process asynchronously with the aforementioned process. In an import process after the base type change process, the DBMS imports, into the table, a chunk in the store format indicated by the base type after change. In the data conversion process, the DBMS converts a chunk in a store format different from the store format indicated by the base type into a chunk in the store format indicated by the base type.

Growing community of inventors

Tokyo, Japan

Taro Fujimoto