Asynchronous replica management in shared nothing architectures

Details Asynchronous replica management in shared nothing architectures Asynchronous replica management in shared nothing architectures

1994-07-15

1995-08-08

Beausoliel, Jr., Robert W.

395600, 395486, 395468, 39518206, G06F 1100, G06F 1500

Patent

active

054407273

ABSTRACT:
In a partitioned database system of the Shared Nothing type, one or more secondary replicas of each partition are maintained by spooling (i.e., asynchronously sending) modified (usually called dirty) pages from the primary replica to the secondary replica(s) rather than by using a synchronous page update or by sending log entries instead of entire pages. A Write-Ahead Log protocol is used so that a dirty page is not forced to non-volatile storage until a log record of the modification is created and written to non-volatile storage. Replica updating does not delay the committing of transactions because replica updating is done asynchronously with respect to transaction processing. Since dirty pages are sent rather than only log entries, disk accesses and processing at the secondary replica(s) arising from the maintaining of the replicas are minimized as well. Only one centrally accessible log is maintained for all replicas of the same partition.

REFERENCES:
patent: 4432057 (1984-02-01), Daniell et al.
patent: 4507751 (1985-03-01), Gawlick et al.
patent: 4819156 (1989-04-01), DeLorme et al.
patent: 4819159 (1989-04-01), Shipley et al.
patent: 5043866 (1991-08-01), Myre, Jr. et al.
patent: 5084816 (1992-01-01), Boese et al.
patent: 5155845 (1992-10-01), Beal et al.
patent: 5193162 (1993-03-01), Bordsen et al.
Hvasshovd et al "Critical Issues in the Design of a Fault-Tolerant Multiprocessor Database Server" 1991 IEEE pp. 226-231.
Rahm "Recovery Concepts for Data Sharing Systems" 1991 IEEE pp. 368-375.
King et al "Overview of Disaster Recovery for Transaction Processing Systems" 1990 IEEE pp. 286-293.
Dewitt et al "The Gamma Database Machine Project" IEEE Trans. on Knowledge and Data Eng. vol. 2 No. 1 Mar. 1990.
Lyon "Design Considerations in Replication Database Systems for Disaster Protected" 1988 IEEE pp. 428-430.
Hsiao et al "A Performance Study of Three High Availability Data Replication Stategies" IEEE 1991 @ Proc. of the 1st International Conf. on Parallel and Distributed Info. Systems 4-6 Dec. 1991 pp. 18-28.
Hvasshovd et al "Critical Issues in the Design of a Fault-Tolerant Multiprocessor Database Server" IEEE Proc. of the 1st Int. Conf. on Parallel & Distributed Info. Systems 4-6 Dec. 1991 pp. 226-231.

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