Empirical Performance Evaluation of
نویسندگان
چکیده
Database Sharing (DB-sharing) refers to a general approach for building a distributed high performance transaction system. The nodes of a DB-sharing system are locally coupled via a high-speed interconnect and share a common database at the disk level. This is also known as a “shared dis~ approach. We compare database sharing with the database partitioning (shared nothing) approach and discuss the functional DBMS components that require new and coordinated solutions for DB-sharing. The performance of DB-sharing systems critically depends on the protocols used for concurrency and coherency control. The frequency of communication required for these functions has to be kept as low as possible in order to achieve high transaction rates and short response times. A trace-driven simulation system for DB-sharing complexes has been developed that allows a realistic performance comparison of four different concurrency and coherency control protocols. We consider two locking and two optimistic schemes which operate either under central or distributed control. For coherency control, we investigate so-called on-request and broadcast invalidation schemes, and employ buffer-to-buffer communication to exchange modified pages directly between different nodes. The performance impact of random routing versus affinity-based load distribution and different communication costs is also examined. In addition, we analyze potential performance bottlenecks created by hot spot pages.
منابع مشابه
Data envelopment analysis in service quality evaluation: an empirical study
Service quality is often conceptualized as the comparison between service expectations and the actual performance perceptions. It enhances customer satisfaction, decreases customer defection, and promotes customer loyalty. Substantial literature has examined the concept of service quality, its dimensions, and measurement methods. We introduce the perceived service quality index (PSQI) as a sing...
متن کاملEvaluation of Strategic Performance with Fuzzy Data Envelopment Analysis
This study intends to expand a set of proper performance evaluation indices which embraces strategies for sustaining top performance using SWOT analysis inside a balanced scorecard (BSC) outline for the large commercial bank branches in IRAN by operating a fuzzy Data Envelopment Analysis (FDEA). Through literature reviews and the banks’ experts and managers opinions and who have real practical ...
متن کاملInvestigating the Empirical Effect of ABC Stages on the Performance of Companies
The major aim of this study is to extend Zhang and Isa’s (2011) study by investigating the moderating effect of the stages of ABC application on the firms’ performance. This study selects 106 Chinese manufacturing companies and employs multiple regression technique and structural equation modelling. It examines whether successful application of the ABC directly affects the firm’s performance, a...
متن کاملEvaluation of Empirical Correlations for Predicting Gas Hydrate Formation Temperature
One of the important, practical and simple methods for hydrate formation conditionis empirical equations, and so far many empirical equations have been presented to predict thetemperature and pressure of hydrate formation. In this study, the methods and empiricalcorrelations have been reviewed and their predictive capabilities have been evaluated with ...
متن کاملPerformance Evaluation of Dynamic Modulus Predictive Models for Asphalt Mixtures
Dynamic modulus characterizes the viscoelastic behavior of asphalt materials and is the most important input parameter for design and rehabilitation of flexible pavements using Mechanistic–Empirical Pavement Design Guide (MEPDG). Laboratory determination of dynamic modulus is very expensive and time consuming. To overcome this challenge, several predictive models were developed to determine dyn...
متن کاملComparison of different empirical methods for estimating ddaily reference evapotranspiration in the humid cold climate (case study: Borujen, Shahrekord, Koohrang and Lordegan)
The proposed method for calculation of potential evapotranspiration is Penman-Monteith FAO method, but there are other methods that require less meteorological data but estimates close to the FAO Penman-Monteith method in different climatic conditions. Performance evaluation of these methods on the same basis is prerequisite for selecting an alternative approach in accordance with available da...
متن کامل