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Performance evaluation of concurrency control and locking in distributed database systems

Jiazhen, Lu; (1990) Performance evaluation of concurrency control and locking in distributed database systems. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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Abstract

This thesis studies the methods of evaluating the performance of centralized and distributed database systems by using analytic modeling, simulation and system measurement. Numerous concurrency control and locking mechanisms for distributed database systems have been proposed and implemented in recent years, but relatively little work has been done to evaluate and compare these mechanisms. It is the purpose of this thesis to address these problems. The analytic modeling intends to provide a consistent and novel modeling method to evaluate the performance of locking algorithms and concurrency control protocols in both centralized and distributed databases. In particular, it aims to solve the problems of waiting in database locking, and blocking in concurrency control protocol which have not been solved analytically before. These models, which are based on queueing network and stochastic analysis, are able to achieve a high degree of accuracy in comparison with published simulation results. In addition, detailed simulation models are built to validate the analytic models and to study various concurrency control protocols and distributed locking algorithms; these simulation models are able to incorporate system details at very low levels such as the communication protocols, elementary file server operations, and the lock management mechanisms. In order to further validate the findings through measurements, an actual' distributed database management system is specifically implemented which adopts the two phase commit protocol, majority consensus update algorithm, multicast communication primitives, dynamic server configuration, and failure recovery. Various performance measurements are obtained from the system such as the service time characteristics of communication and file servers, system utilization and throughput, response time, queue length and lock conflict rates. The performance results reveal some interesting phenomena such as systems with coarse granularity outperform those with fine granularity when lock overhead is not negligible, and that the effect of the database granularity is small in comparison with the effect of the number of replicated copies. Results also suggest that centralized two phase commit protocol outperforms other types of two phase commit protocol, such as basic, majority consensus and primary copy two phase commit protocol under some circumstances.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Performance evaluation of concurrency control and locking in distributed database systems
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Thesis digitised by ProQuest.
Keywords: Applied sciences; Distributed computing
URI: https://discovery.ucl.ac.uk/id/eprint/10107653
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