Other

Hitachi, Ltd.

Hitachi Software Engineering Company, Ltd.

Keisuke Toda

Kota Yamaguchi

Kazuo Masai

Kiyomi Hirohata

Hideaki Kasao

Nobuo Kawamura

Yasuhiro Kamada

Hiroki Asada

Junko Katsumata

Yoji Narisawa

Provided is a display unit that includes a first display section and a second display section. The first display section is configured to perform picture display and transmissive display. The picture display is based on a picture signal and performed on pixels in a partial region corresponding to a partial image part in a frame image represented by the picture signal, and the transmissive display is performed on pixels in a region other than the partial region. The second display section is provided behind the first display section, and configured to perform dummy display and transmissive display. The dummy display is performed on pixels in the partial region to display a dummy image that is one of a uniform image and a non-uniform image, and the transmissive display is performed on pixels in the region other than the partial region.

Display unit, display system, and display method

If relocation of a table with a high reference frequency is made possible, the database management method and system are arranged to improve performance according to the number of increased nodes and accumulate a reference frequency of each external storage unit allocated to each database management node. A data storage area for storing the table with a high reference frequency, located in the external storage unit, is specified as a shared data area to be referenced by plural nodes. The system is controlled to cause the nodes to refer to the shared table stored in the shared data area on any timing in parallel. This prevents load from being concentrated onto the node allocated to the data area.

Data processing system and method with data sharing for the same

A parallel database management system with a database divided into a plurality of external memory units is disclosed. A control CPU, upon receipt of a request for access to the database, decides whether the access request is for storing or searching a record. For a record storage request, the control CPU determines an external memory unit to store the record using a hash function. In the case of a record search request, on the other hand, all the external memory units are searched in parallel without using the hash function thereby to obtain the desired record. The hash function is altered upon addition of an external memory unit.

Parallel database record distribution method and parallel database management system

A parallel data base management system with a data base divided into a plurality of external memory units is disclosed. A control CPU, upon receipt of a request for access to the data base, decides whether the access request is for storing or searching a record. For a record storage request, the control CPU determines an external memory unit to store the record using a hash function. In the case of a record search request, on the other hand, all the external memory units are searched in parallel without using the hash function thereby to obtain the desired record. The hash function is altered upon addition of an external memory unit.

Parallel data base record distribution method and parallel data base management system

Parallel data base record distribution method and parallel data base

Growing community of inventors

Fujisawa, Japan

Keisuke Toda