Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Multilevel Transactions and Object-Model Transactions

  • Gerhard Weikum
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_728

Synonyms

Layered transactions; Open nested transactions

Definition

Multilevel transactions are a variant of nested transactions where nodes in a transaction tree correspond to executions of operations at particular levels of abstraction in a layered system architecture. The edges in a tree represent the implementation of an operation by a sequence (or partial ordering) or operations at the next lower level. An example instantiation of this model are transactions with record and index-key accesses as high-level operations which are in turn implemented by reads and writes of database pages as low-level operations. The model allows reasoning about the correctness of concurrent executions at different levels, aiming for serializability at the top level: equivalence to a sequential execution of the transaction roots. This way, semantic properties of operations, like different forms of commutativity, can be exploited for higher concurrency, and correctness proofs for the corresponding...

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department 5: Databases and Information SystemsMax-Planck-Institut für InformatikSaarbrückenGermany

Section editors and affiliations

  • Panos K. Chrysanthis
    • 1
  1. 1.Dept. of Computer ScienceUniv. of PittsburghPittsburghUSA