Concurrency Control for Intermittently Connected Databases

L.C. Shu and C.-M. Tsai (Taiwan)


Optimistic replica control, serializability, mobile computing.


An intermittently connected database (ICDB) environment is one in which a number of clients work asynchronously while disconnected from the server, each operating on a part of the entire database. The clients are only con nected to the server when they need to download or update data. Because clients may update shared data while dis connected, certain synchronization mechanisms must be in place to ensure data consistency. In this paper, we made a couple observations which greatly simplify our design and analysis of two concurrency control protocols for ICDB systems. While both protocols use an optimistic strategy and guarantee serializable executions, their characteristics are different in some other respects, thus making them ap propriate for different applications.

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