Robustness against Read Committed for Transaction Templates with Functional Constraints

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...

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Vydáno v:	Logical methods in computer science Ročník 19, Issue 4
Hlavní autoři:	Vandevoort, Brecht, Ketsman, Bas, Koch, Christoph, Neven, Frank
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Logical Methods in Computer Science e.V 25.12.2023
Témata:	computer science - databases computer science - logic in computer science
ISSN:	1860-5974, 1860-5974
On-line přístup:	Získat plný text
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Popis
Shrnutí:	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 robust against RC. Previous work has yielded a tractable procedure for deciding robustness against RC for workloads generated by transaction programs modeled as transaction templates. An important insight of that work is that, by more accurately modeling transaction programs, we are able to recognize larger sets of workloads as robust. In this work, we increase the modeling power of transaction templates by extending them with functional constraints, which are useful for capturing data dependencies like foreign keys. We show that the incorporation of functional constraints can identify more workloads as robust that otherwise would not be. Even though we establish that the robustness problem becomes undecidable in its most general form, we show that various restrictions on functional constraints lead to decidable and even tractable fragments that can be used to model and test for robustness against RC for realistic scenarios.
ISSN:	1860-5974 1860-5974
DOI:	10.46298/lmcs-19(4:39)2023