Simple Rational Guidance for Chopping up Transactions

Dennis Shasha, Eric Simon, Patrick Valduriez

Research output: Contribution to journalArticlepeer-review


Chopping transactions into pieces is good for performance but may lead to non-serializable executions. Many researchers have reacted to this fact by either inventing new concurrency control mechanisms, weakening serializability, or both. We adopt a different approach. We assume a user who • has only the degree 2 and degree 3 consistency options offered by the vast majority of conventional database systems; and •knows the set of transactions that may run during a certain interval 1992. Given this information, our algorithm finds the finest partitioning of a set of transactions TranSet with the following property; if the partitioned transactions execute serializably, then TranSet executes serializably. This permits users to obtain more concurrency while preserving correctness. Besides obtaining more inter-transaction concurrency, chopping transactions in this way can enhance intra-transaction parallelism. The algorithm is inexpensive, running in O(n x (e + m)) time using a naive implementation where n is the number of edges in the conflict graph among the transactions, and m is the maximum number of accesses of any transaction. This makes it feasible to add as a tuning knob to practical systems.

Original languageEnglish (US)
Pages (from-to)298-307
Number of pages10
JournalACM SIGMOD Record
Issue number2
StatePublished - Jan 6 1992

ASJC Scopus subject areas

  • Software
  • Information Systems


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