Definition
Specifications of data contain semantic information that can be exploited to increase concurrency. For example, two insert operations on a multiset object commute and hence, can be executed in parallel; further, regardless of whether one operation commits, the other can still commit. Applying the same rule, two push operations on a stack object do not commute and hence cannot be executed concurrently. Several schemes have been proposed for exploiting the semantics of operations have to provide more concurrency than obtained by the conventional classification of operations as reads or writes.
Key Points
In most semantics-based protocols, conflicts between operations is based on commutativity, an operation o i which does not commute with other uncommitted operations will be made to wait until these conflicting operations abort or commit. Some protocols use operations’ return value commutativity, wherein information about the results of executing an operation is used in...
Recommended Reading
Badrinath BR, Ramamritham K. Semantics-based concurrency control: beyond commutativity. ACM Trans Database Syst. 1991;17(1):163–99.
Chrysanthis PK, Raghuram S, Ramamritham K Extracting concurrency from objects: a methodology. In: Proceedings of ACM SIGMOD international confernce on management of data. 1991.
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Ramamritham, K., Chrysanthis, P.K. (2016). Semantics-Based Concurrency Control. In: Liu, L., Özsu, M. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4899-7993-3_719-2
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DOI: https://doi.org/10.1007/978-1-4899-7993-3_719-2
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