Conflict resolution in database replication through...

Details Conflict resolution in database replication through... Conflict resolution in database replication through...

2007-08-17

2009-12-01

Rones, Charles (Department: 2164)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C707S793000

Reexamination Certificate

active

07627611

ABSTRACT:
In a method for distributed database replication, local change records describing the local changes to the database at a node are transmitted to other nodes. Each node receives from the other nodes other change records describing changes to the database at the other nodes, and a log of change records is accumulated. Each change record describes a change made to a row at a source node, e.g., using data such as an identifier of the source node, a source node abstract clock value, a row identifier, and cell values of the row before and after the change. Autonomously from the other nodes, each node applies the other change records to its local copy of the database, considering the other change records in source node abstract clock order. The other change records are applied by checking for a collision between the other change records and the database and, when a collision is detected, selecting a persistent result by sequentially scanning through the log of change records in order of local abstract clock value to identify the persistent result.

REFERENCES:
patent: 5737601 (1998-04-01), Jain et al.
patent: 5924094 (1999-07-01), Sutter
patent: 5937414 (1999-08-01), Souder et al.
patent: 6820088 (2004-11-01), Hind et al.

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