Data processing: database and file management or data structures – Database design – Data structure types
Patent
1997-07-17
1999-05-25
Hua, Ly V.
Data processing: database and file management or data structures
Database design
Data structure types
39518204, 39518211, 39518213, 707202, 707200, G06F 1200
Patent
active
059076739
ABSTRACT:
A computer system which can achieve rollback operation when a fault occurs in the system without waiting for side-tracking of pre-update data during updating of a file. When a file write request has been made, "file writing information" pertaining to the file write is saved in a pending queue and only a primary file is immediately updated. After a checkpoint has been acquired, the "file writing information" saved in the pending queue is shifted to a confirmed queue, and is then written to a back-up file. When performing recovery, all pre-update data which corresponds to the data which has been updated since the last checkpoint acquired is read from the back-up file, based on the "file writing information" saved in the pending queue. The primary file is then restored to its state at the checkpoint time by using the pre-update data which has been read from the backup file.
REFERENCES:
patent: 5235700 (1993-08-01), Alaiwan et al.
patent: 5530801 (1996-06-01), Kobayashi
patent: 5621885 (1997-04-01), Del Vigna, Jr.
patent: 5737514 (1998-04-01), Stiffler
patent: 5794252 (1998-08-01), Bailey et al.
Hirayama Hideaki
Shirakihara Toshio
Hua Ly V.
Kabushiki Kaisha Toshiba
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