On Designing Dependable Services with Diverse Off-The-Shelf SQL Servers
by Ilir Gashi, Peter Popov, Vladimir Stankovic and Lorenzo Strigini. in "Architecting Dependable Systems II", Lecture Notes in Computer Science, (R. de Lemos, C. Gacek and A. Romanovsky, Eds.), vol. 3069, pp. 191-214, Springer-Verlag, 2004 Lecture Notes in Computer Science
ABSTRACT
The most important non-functional requirements for an SQL server are performance and dependability. This paper argues, based on empirical results from our on-going research with diverse SQL servers, in favour of diverse redundancy as a way of improving both. We show evidence that current data replication solutions are insufficient to protect against the range of faults documented for database servers; outline possible fault-tolerant architectures using diverse servers; discuss the design problems involved; and offer evidence of the potential for performance improvement through diverse redundancy.
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