Multi-program processing system and rollback method for file...

Details Multi-program processing system and rollback method for file... Multi-program processing system and rollback method for file...

2006-01-17

2006-01-17

Alam, Shahid (Department: 2162)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C709S201000, C718S103000

Reexamination Certificate

active

06988112

ABSTRACT:
To provide a multi-program processing system, which prioritizes reference and update of a block to be an object of rollback without waiting for the rollback being finished and can improve efficiency of processing a program when one file is simultaneously referred to and updated by a plurality of programs. Even if the block is being updated by another program, a file I/O section requests a journal for the block from the journal sharing section instead of reading the block from a data file, and transfers the contents of the block in a state before it is updated by another program to the program if the block is being rolled back. In response to an update request from the program, the file I/O section also refers the block exclusion section for the state of a block as mentioned above, and if another program does not perform neither reference nor update, the file I/O section causes the journal collecting section to save a block before update in the journal file from the data file as a journal, and the data file is updated.

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patent: 2001/0049714 (2001-12-01), Kikuchi
patent: H10-293712 (1998-11-01), None

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