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A Theory of Transactions on Recoverable Search Trees

  • Seppo Sippu
  • Eljas Soisalon-Soininen
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1973)

Abstract

We consider transactions running on a database that consists of records with unique totally-ordered keys and is organized as a sparse primary search tree such as a B-tree index on disk storage. We extend the classical read-write model of transactions by considering inserts, deletes and key-range scans and by distinguishing between four types of transaction states: forward-rolling, committed, backward-rolling, and rolled- back transactions. A search-tree transaction is modelled as a two-level transaction containing structure modifications as open nested subtransactions that can commit even though the parent transaction aborts. Isolation conditions are defined for search-tree transactions with nested structure modifications that guarantee the structural consistency of the search tree, a required isolation level (including phantom prevention) for database operations, and recoverability for structure modifications and database operations.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Seppo Sippu
    • 1
  • Eljas Soisalon-Soininen
    • 2
  1. 1.Department of Computer ScienceUniversity of HelsinkiUniversity of HelsinkiFinland
  2. 2.Department of Computer Science and EngineeringHelsinki University of TechnologyHUTFinland

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