Nec Corporation

Tsuyoshi Mabuchi

Tetsuo Inoue

Hajime Komura

A new conversion database associated with information to be finally stored in a host information database is stored in a RAM along with a previous conversion database. Each processing unit refers to the new conversion database to identify data to be held in the host information database of the processing unit itself and refers to the previous conversion database to identify the processing unit which currently holds the data thus identified. The processing unit further relocates the data to be held in the processing unit itself from the processing unit thus identified.

Database server capable of relocating data distributed among plural processors and retrieving data method

A plurality of database hosts hold subscriber information in a distributed manner. A retrieval server processes inquires (host retrieval requests) on which of the database hosts has desired subscriber information stored therein. The retrieval server includes a plurality of processors, and the plurality of processors performs processing in parallel. Therefore, inquiries can be processed at a high speed. Further, a conversion information database and a host information database are provided as in-memory databases, which allow inquiry processes to be processed at a high speed. A call control server can efficiently acquire subscriber information from the database host based on the result of an inquiry made to the retrieval server.

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Tokyo, Japan

Tsuyoshi Mabuchi