Hitachi, Ltd.

Hitachi Computer Engineering Co., Ltd.

Akira Kito

Hirofumi Yamashita

Kanji Kato

Mitsuru Akizawa

Hidenori Yamada

Takehisa Hayashi

Ryoichi Sasaki

Satoshi Yoshizawa

Katsumi Tada

Hisamitsu Kawaguchi

Tadashi Kaji

Kuniaki Tabata

Satoru Tezuka

Seiichi Susaki

Hideki Murayama

Katsuyuki Umezawa

Tetsuya Hashimoto

Toru Horimoto

Hiroshi Yashiro

Kimitoshi Yamada

Masahiko Yamauchi

Makoto Kitagawa

Hiroyoshi Suzuki

Tsutomu Goto

Takashi Akaosugi

Toshiyuki Maki

In a transaction processing method for executing a series of a plurality of transactions in accordance with a workflow, compensation processing is registered as an error recovery flow when each transaction is executed, the compensation processing executing error recovery processing when an error occurs while the transaction is executed, and a series of compensation processing is executed in parallel in accordance with the registered error recovery flow when an error occurs while any of the transaction is executed.

Transaction processing method and apparatus

A distributed object system comprising at least one object distributing server, at least one client terminal and at least one server object execution server according to the present invention, including: an object distributing server for storing an object program to which an electronic signature is affixed; a client terminal including means for down-loading the object program from the object distributing server, means for verifying the electronic signature affixed to the object program, means for executing the client object program when the completeness of the object program is confirmed and the user of the client terminal beforehand permits execution of the client object program which is electronically signed by a signatory, and means for transmitting the electronic signature affixed to the object program to a server object execution server; and a server object execution server including means for verifying the signature received, and means for supplying services to the user of the client terminal when the completeness of the object program is confirmed and the user and the object program permit use of the services in advance, which makes it possible to prevent a client object which is down-loaded to a client terminal through a network and executed therein from carrying out unjustified processing (not intended by a user using the client terminal) by using authority of the user.

Distributed object system and service supply method therein

A distributed shared memory management system for a distributed shared memory computer system having a plurality of computers interconnected by a network, each computer having an independent address space and logically sharing data physically distributed to a storage of each computer. Each computer running a program for reading/changing the shared data includes a coherence control designation command for designating to enter a mutual exclusion state in which two or more computers cannot change the logically single shared data, a coherence control release command for designating a release of the mutual exclusion state, and a coherence control execution command for reflecting the contents of the shared data changed between the coherence control designation command and the coherence control release command, upon the logically single shared data in another computer. At least one of the plurality of computers includes a request message queue for storing a coherence control request message issued by the coherence control execution command when the coherence control designation command is executed. The coherence control designation command includes data for designating the order of reading/changing the shared data, and the request message queue includes a counter for storing a current state regarding the control of the order of reading/changing the shared data and a unit for storing a value regarding the control of the order of reading/changing the shared data.

Distributed shared data management system for controlling structured

In a computer system having an interface with an I/O bus given disconnect/reconnect functions and a plurality of magnetic disk subsystems connected with the I/O bus, control divides a file at a disk access time with reference to disk management information, file management information and file descriptor translation information to read/write a plurality of such files asynchronously. Thus, high speed file access can be realized by only the plurality of magnetic disk subsystems without requiring any special control hardware. A corresponding relation between subfiles in a virtual directory and the application request file can be taken to construct the directory, thus making the divided storage transparent to the application.

High speed file access control method and computer system including a

A typical structure of a file server system is a file server system having a plurality of file servers connected in parallel on a network and sharing files placed distributedly in the file servers among a plurality of client computers, and there are provided in a specific file server among the plurality of file servers, a load information monitoring device for measuring respective loads of the plurality of file servers and a file access request distributing device for referring to the loads measured by the load information monitoring device so as to select a file server having a light load from the plurality of file servers having light loads, and distributing a file access request transmitted from client computers to the selected file server.

File server system and file access control method of the same

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Ebina, Japan

Akira Kito