Serializable Snapshot Isolation for Replicated Databases in High-Update Scenarios

Many proposals for managing replicated data use sites running the Snapshot Isolation (SI) concurrency control mechanism, and provide 1-copy SI or something similar, as the global isolation level. This allows good scalability, since only ww-conflicts need to be managed globally. However, 1-copy SI can lead to data corruption and violation of integrity constraints. 1-copy serializability is the global correctness condition that prevents data corruption. The authors propose a new algorithm Replicated Serializable Snapshot Isolation (RSSI) that uses SI at each site, and combines this with a certification algorithm to guarantee 1-copy serializable global execution. Management of ww-conflicts is similar to what is done in 1-copy SI.

Provided by: VLD Digital Topic: Data Management Date Added: Sep 2011 Format: PDF

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