Data processing system and method for executing snapshot dumps

Patent 5644701 Issued on July 1, 1997. Estimated Expiration Date:

December 28, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Optimistic recovery in a distributed processing system
Patent #: 4665520
Issued on: 05/12/1987
Inventor: Strom , et al.

Memory back up system with one cache memory and two physically separated main memories
Patent #: 4819154
Issued on: 04/04/1989
Inventor: Stiffler , et al.

Distributed data base system of composite subsystem type, and method fault recovery for the system
Patent #: 5065311
Issued on: 11/12/1991
Inventor: Masai, et al.

Method for managing database recovery from failure of a shared store in a system including a plurality of transaction-based systems of the write-ahead logging type
Patent #: 5280611
Issued on: 01/18/1994
Inventor: Mohan, et al.

Recovery logging in the presence of snapshot files by ordering of buffer pool flushing
Patent #: 5369757
Issued on: 11/29/1994
Inventor: Spiro, et al.

Trace tool for serial, optical interface
Patent #: 5404504
Issued on: 04/04/1995
Inventor: Byers, et al.

CPU implemented method for backing up modified data sets in non-volatile store for recovery in the event of CPU failure
Patent #: 5454099
Issued on: 09/26/1995
Inventor: Myers, et al.

Method and means for archiving modifiable pages in a log based transaction management system
Patent #: 5455946
Issued on: 10/03/1995
Inventor: Mohan, et al.

Methods and apparatus for updating information in a computer system using logs and state identifiers Patent #: 5485608
Issued on: 01/16/1996
Inventor: Lomet, et al.

Inventor

Takewaki, Toshiaki

Application

No. 365545 filed on 12/28/1994

US Classes:

714/20, Plural recovery data sets containing set interrelation data (e.g., time values or log record numbers)711/144Cache status data bit

Examiners

Primary: Beausoliel, Robert W. Jr.
Assistant: Palys, Joseph E.

Attorney, Agent or Firm

Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.

Foreign Patent References

6-28315 JP 02/12/1994

International Class

G06F 001/00

Foreign Application Priority Data

1993-12-29 JP

Abstract

At the time of a snapshot dump, a main memory storage unit stores only the memory contents of the dirty ones whose contents have changed of the pages in the main memory after the execution of the preceding snapshot dump. Data indicating the storage location of the contents of the pages stored at that time is stored in a storage device in pages in the form of a storage location list. Furthermore, data indicating the storage location of page contents is stored in a storage location list storage area each time a snapshot dump is executed. When the memory contents of a given snapshot dump are restored, the corresponding location list is taken out from the storage location list storage area. According to the storage location list, the corresponding memory contents are restored into the original page location in the main memory.

Other References

Wu et al., "Error Recovery in Shared Memory Multiprocessors Using Private Caches", IEEE Trans. on Parallel and Distributed systems, vol. 1, Iss. 2 Apr. 1990
Pilarski et al., "Checkpointing for Distributed Databases: Starting From the Basics", IEEE Trans. on Parallel and Distributed Systems, vol. 3, Iss. 5 Sep. 1992
Crus et al., "Incremental Database Log Image Copy", IBM TDB vol. 25, No. 7b Dec. 198