High-speed database checkpointing through sequential I/O to disk

Details High-speed database checkpointing through sequential I/O to disk High-speed database checkpointing through sequential I/O to disk

1997-01-22

1999-11-30

Beausoliel, Jr., Robert W.

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

G06F 1100

Patent

active

059960884

ABSTRACT:
A method for performing a checkpointing operation in a client/server computer system for safeguarding data in case of a failure. The records of a database are stored in a mass storage device, such as a hard disk drive array. A separate disk drive is dedicated for use only in conjunction with checkpointing. Periodically, when a checkpoint process is initiated, the server writes a number of its modified records to checkpoint files which are stored by the dedicated checkpoint disk drive. The write operation is performed through one or more sequential I/O operations. Thus, the modified records are stored in consecutive sectors of the hard disk drive. If the server becomes disabled, the data can be recovered by reading the contents of the most recent checkpoint files and loading the contents sequentially back to the server's main memory.

REFERENCES:
patent: 5333303 (1994-07-01), Mohan
patent: 5369757 (1994-11-01), Spiro et al.
patent: 5590298 (1996-12-01), Kawamoto
patent: 5701473 (1997-12-01), Braseth et al.
patent: 5724581 (1998-03-01), Kozakura
patent: 5737514 (1998-04-01), Stiffler

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