Multiplex communications – Wide area network – Packet switching
Patent
1991-05-07
1993-11-02
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 943, 370 37, 34082502, 340826, H04J 312
Patent
active
052589820
ABSTRACT:
A method of reducing the number of messages required for sync point (commit or backout) operations by leaving out nodes that have not participated in the corresponding transaction. A two-phase sync point protocol is used in a distributed transaction processing network to commit or backout transactions in the network. In response to the beginning of sync point operations on a transaction x, each node determines if each of its partner nodes stated on the sync point operation for transaction x-1 that the partner could be left out of sync point operations for transaction x-1. If a partner node did so state that it could be left out, the present node determines if the partner node was included by the present node during the present transaction x. If the partner node was not included during the present transaction, the present node excludes the partner node from the present sync point operations.
REFERENCES:
patent: 4769772 (1988-09-01), Dwyer
Transaction Management in the R* Distributed Database Management System, by C. Mohan, B. Lindsay, and R. Obermarck.
ISO/IEC JTC 1/SC 21 N2608 Information Processing Systems-Part 1.
ISO/IEC JTC 1/SC 21 N2607 Information Processing Systems-Part 2.
ISO/IEC JTS 1/SC 21 N2608 Information Processing Systems-Part 3.
Britton Kathryn H.
Citron Andrew P.
Mohan Chandrasekaran
Samaras George M.
Blum Russell W.
Herndon Jerry W.
International Business Machines - Corporation
Olms Douglas W.
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