2005•东华大学学报：英文版Requires access

Nested Transaction Concurrency Control in Parallel Real-Time Databases

Pan Yi, LU Sheng

Abstract

An integrated method for concurrency control in parallel real-time databases has becn proposed in this paper. The nested transaction model has been investigated to offer more atomic execution units and finer grained control within in a transaction. Based on the classical nested locking protocol and the speculative concurrency control approach, a twoshadow adaptive concurrency control protocol, which combines the Sacrifice based Optimistic Concurrency Control(OPT-Sacrifice) and High Priority two-phase locking (HP-2PL) algorithms together to support both optimistic and pessimistic shadow of each sub-transaction, has been proposed to increase the likelihood of successful timely commitment and to avoid unnecessary replication overload.

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Key concepts: Serializability, Optimistic concurrency control, Concurrency control, Computer science, Nested transaction, Non-lock concurrency control, Distributed transaction, Timestamp-based concurrency control