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<p><b>Abstract</b>—Multiversion two-phase locking (MV2PL) provides on-line serializable queries without introducing the long blocking delays that can occur with conventional two-phase locking (2PL). MV2PL requires indexing structures, however, that are capable of supporting multiple versions of data. In this paper, we present several options for extending single-version indexing schemes for use with MV2PL. These basic approaches are largely orthogonal to the underlying indexing structure (e.g., hashing or B+ trees). The options considered differ in where they place version selection information (i.e., references to individual versions); this information is placed either with the data or with the index entries of one or more of the indices. We also present the results from a performance study that show that placing the version selection information with the data is usually the best option, since it keeps the indices smaller and thus enables a larger fraction of the index pages to remain cached in the buffer pool.</p>
Indexing, multiversion concurrency control, multiversion locking, transaction processing, query processing.

P. M. Bober and M. J. Carey, "Indexing for Multiversion Locking: Alternatives and Performance Evaluation," in IEEE Transactions on Knowledge & Data Engineering, vol. 9, no. , pp. 68-84, 1997.
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