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On the complexity of XPath containment in the presence of disjunction, DTDs, and variables

Frank Neven ; Thomas Schwentick.

XPath is a simple language for navigating an XML-tree and returning a set of answer nodes. The focus in this paper is on the complexity of the containment problem for various fragments of XPath. We restrict attention to the most common XPath expressions which navigate along the child and/or&nbsp;[&hellip;]

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Robustness against Read Committed for Transaction Templates with Functional Constraints

Brecht Vandevoort ; Bas Ketsman ; Christoph Koch ; Frank Neven.

The popular isolation level Multiversion Read Committed (RC) trades some of the strong guarantees of serializability for increased transaction throughput. Sometimes, transaction workloads can be safely executed under RC obtaining serializability at the lower cost of RC. Such workloads are said to be&nbsp;[&hellip;]

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