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Many applications, such as e-commerce, routinely use copies of data that are not in sync with the database due to heuristic caching strategies used to enhance performance. We study concurrency control for a transactional model that allows update transactions to read out-of-date copies. Each read operation carries a "freshness constraint" that specifies how fresh a copy must be in order to be read. We offer a definition of correctness for this model and present algorithms to ensure several ofdoi:10.1145/1142473.1142540 dblp:conf/sigmod/BernsteinFGRT06 fatcat:azwmlwu6yzdt7a5bowerkg6pse
more »... most interesting freshness constraints. We outline a serializability-theoretic correctness proof and present the results of a detailed performance study.
Simulation & Gaming
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