A Performance Evaluation for a Concurrency Control Mechanism in an ODBMS

摘要

Object Oriented transactions often imply the use of a large number of resources that are inaccessible to other incoming transactions if traditional two-phase locking is used to support concurrency. The goal of this research is to present the performance evaluation for a new concurrency control technique, Group Protocol (GP) (9), which is a combination of TWO-Phase Locking (2PL) and Serialization Graph Test (SGT) techniques. GP improves the concurrency control performance by exploiting the navigational nature of long-running, transactions. Navigational Transactions may consist of two or more subtransactions. Depending on the nature of each substransaction they may be executed using parallel processing. The performance evaluation done in this research indicates the applicability of this work for long-running navigational transactions.