Model for Database Reference Strings Based on Behavior of Reference Clusters
نویسنده
چکیده
The observation that references to a particular page are clustered (in time) in typical database reference strings is used as the intuitive motivation for a model of page reference activity in an interactive database system. The model leads to a two-parameter form for the (Denning) working-set functions associated with a page. Methods for estimating parameter values from measurements or from logical descriptions of applications are discussed. Results from the model are shown to agree well with measurements from two database systems.
منابع مشابه
A Fast and Accurate Global Maximum Power Point Tracking Method for Solar Strings under Partial Shading Conditions
This paper presents a model-based approach for the global maximum power point (GMPP) tracking of solar strings under partial shading conditions. In the proposed method, the GMPP voltage is estimated without any need to solve numerically the implicit and nonlinear equations of the photovoltaic (PV) string model. In contrast to the existing methods in which first the locations of all the local pe...
متن کاملAnalysis of Speed Control in DC Motor Drive Based on Model Reference Adaptive Control
This paper presents fuzzy and conventional performance of model reference adaptive control(MRAC) to control a DC drive. The aims of this work are achieving better match of motor speed with reference speed, decrease of noises under load changes and disturbances, and increase of system stability. The operation of nonadaptive control and the model reference of fuzzy and conventional adaptive contr...
متن کاملبررسی نقش انواع بافتار همنویسهها در تعیین شباهت بین مدارک
Aim: Automatic information retrieval is based on the assumption that texts contain content or structural elements that can be used in word sense disambiguation and thereby improving the effectiveness of the results retrieved. Homographs are among the words requiring sense disambiguation. Depending on their roles and positions in texts, homograph contexts could be divided to different types, wit...
متن کاملReference Values for Serum Lipid Profiles in Iranian Adults: A Spline-Based Quantile Regression Method
Background: Reference measurements are used to screen for abnormal blood lipids. The problem is that these reference values obtained in one population cannot be effective for another population. This study aimed to determine the reference values for blood lipids profiles in the population aged 25-64 years in Yazd. Methods: This descriptive study was based on the data of Yazd Health Study (YaHS...
متن کاملA New Clustering Technic by the Preferences of the Objective in Data Envelopment Analysis
The ways of placing decision making units (DMUs) in certain clusters are found as a subject in statistics, these ways usually are heuristic. The proposed clustering approach in this article considers preferences of DMUs. This study applies Data Envelopment Analysis (DEA) DMUs are clustered by solving multi-objective linear problem (MOLP) and by considering preferences of each DMU at production ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- IBM Journal of Research and Development
دوره 22 شماره
صفحات -
تاریخ انتشار 1978