| 摘要 |
The subject invention pertains to transaction processing systems and methodologies that allows update transactions to read stale data copies and update a data store therewith. Each transactional operation, including a read, can carry or be associated with one or more freshness constraints or tests that specify how fresh a data copy must be in order to be read. More specifically, the subject invention provides systems and methods that extend transactions and serializability to account for out-of-date reads that are justified by freshness requirements.
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