Abstract
Discusses the issues involved in providing an integrated fault tolerance solution to enterprise applications with a distributed three-tier architecture. We examine end-to-end fault tolerance requirements for interactions between the tiers and describe available solutions. We perform a detailed assessment of fault tolerance technologies that are available for the database tier, which poses most challenging reliability and high-availability problems. In particular, we discuss and compare the tradeoffs made in commercial database systems between different aspects of fault tolerance.

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