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Concurrency Controls for Global Procedures in Federated Database Systems

Report ID:
May 1987
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A federated database system is a collection of autonomous databases cooperating for mutual benefit. Global procedures can access several databases, but controlling concurrent database accesses by them is problematic. In particular, each database has its own (possibly different) concurrency control mechanism,
and it must remain independent from the global controls. Furthermore, it may be difficult for the global controls to know exactly what granules (e.g., records or pages) are touched by each database access. In this paper we discuss the concurrency control problem for federated database systems, and suggest two
mechanisms that may satisfy the requirements.

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