Hitachi, Ltd.

Hitachi Seibu Soft Ware Co., Ltd.

Hiromichi Ishikawa

Tetsuya Watanabe

Rinichi Takashi

Hideki Matsuno

Kazuhiro Katayama

Masaaki Hatano

In a distributed application program system which includes a data transmission line, a plurality of server systems connected to the data transmission line and each including at least one application program for executing data processing by running the program, and a client system connected to the data transmission line and including at least one application program for executing data processing by running the application program, a method of controlling the distributed application program system is performed. The method includes the steps of preparing a library for storing system specifications of the individual systems in association with one of the plural server systems which is to serve as a master server system, and deciding whether or not a table provided in association with the client system already contains system specifications of the server system to which data processing is to be entrusted. Unless the table holds the system specifications, the client system requests sending of the system specifications and stores the system specifications received from the master server system. Thereafter, the client system converts the data so as to have a format which conforms with the system specifications stored in the table.

System and method for distributed data processing using different server

In a distributed system having a plurality of interconnected computer systems each having an application program, a process manager which determines the need for a communication process, determines an identifier of a destination system and a protocol and issues a communication process request in response to a process request for database access from the application program, and a virtual communication user for determining an application context in response to the communication process request from the process manager are provided, and a communication path a protocol machine establishes for the virtual communication user. A plurality of virtual communication users for managing the communication process are provided and each virtual communication user manages a plurality of protocol machines so that a plurality of protocols and application programs are simultaneously used for a plurality of destination systems from one application program.

System for controlling communications between an application and a

A distributed data base access request processing system in a distributed data base system including a computer system having a data base and a plurality of computer system effecting an update or a reference to the data base. A client side requesting a data base access issues a request for a synchronous processing to a server side if the data base access is related to a reference operation; whereas an asynchronous processing is requested if the data base access is associated with an update operation. On receiving such a request of a synchronous processing, the server side returns a response to the client side after the requested data base processing is completed. If an asynchronous processing is requested, the response is returned to the client side without waiting for the completion of the requested data base processing.

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Fujisawa, Japan

Hiromichi Ishikawa