Partial Database Replication and Group Communication Primitives.

Title Partial Database Replication and Group Communication Primitives.
Author(s) G. Alonso
Type inproceedings
Booktitle 2nd European Research Seminar on Advances in Distributed Systems (ERSADS'97)
Zinal (Valais, Switzerland)
Organization Institute of Information Systems, ETH Zürich
Month March
Year 1997


Existing research on replication is generally based on synchronous replication (all copies are kept consistent at all times) and update everywhere (any replica can be updated) approaches. There is a strong belief among database designers, however, that synchronous, update everywhere replication is simply not feasible in a database environment. As a result, most current database replication solutions are asynchronous (copies are not kept consistent at all times) and based on a primary-copy approach (only one master copy can be updated, all other replicas are read-only). One of the reasons for this is that many of the existing database replication protocols ignore the complexities and overhead of the communications involved. Group communication primitives have been suggested as a way to solve this particular problem and to provide the support required to implement synchronous, update everywhere replication. This approach has considerable potential, its main drawback being that there is still a big gap, both conceptual and practical, between group communication protocols and databases. Although some work has been done to bridge this gap, a significant number of questions remain open. One of them is how to support partial replication.
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