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Preference Query Analysis And Optimization
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Book Synopsis Preference Query Analysis and Optimization by : Yunjun Gao
Download or read book Preference Query Analysis and Optimization written by Yunjun Gao and published by Springer. This book was released on 2017-11-02 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book analyzes unexpected preference query results for three problems: causality and responsibility problems, why-not and why questions, and why-few and why-many questions. Further, it refines preference queries and discusses how to modify the original preference query based on different objectives, in order to obtain satisfying results. This highly informative and carefully presented book provides valuable insights for researchers, postgraduates and practitioners with an interest in database usability.
Book Synopsis Graph-based Algorithms for Pareto Preference Query Evaluation by :
Download or read book Graph-based Algorithms for Pareto Preference Query Evaluation written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Searching a database is one of the most common procedures in everyday life. Usually, the results of such a search match the query parameters perfectly. But if no perfect match is found, the user usually has to find out by himself how to change search parameters in order to get results. To overcome this problem, Kießling has introduced a model of preferences in databases. This model is based on simple strict partial orders as given in expressions like "red is better than blue". For every query, the best-matching objects are returned, whether these are perfect matches or not. A best match is a tuple that matches the preference not worse than any other tuple 6 or as we say 6 that is not dominated by any other tuple. The specific problem we address is finding best matches for Pareto preferences, the combination of preferences with all of them being equally important. This problem is closely related to skyline queries. Based on the better-than graph, a visualization of the strict partial orders constructed by Pareto preferences, we have found a novel type of optimization called pruning that can be applied to all existing generic algorithms. While common generic algorithms rely on tuple-to-tuple comparisons to identify dominated tuples, our optimization technique uses the structure of the better-than graph to identify elements in the order that are definitively dominated by some given tuple. This enables us to omit many comparisons. By further analysis of the better-than graph, we were able to find a new kind of algorithm. This generic algorithm, Hexagon, is capable of finding the best matches in some previously unknown set of tuples in linear time with respect to the size of the better-than graph. Apart from the standard algorithm, we present a number of optimizations for it regarding its memory requirements. But Hexagon is not limited to standard preference queries. We also address top-k queries with a variant of Hexagon. These queries return the best k tuples of an inp.
Book Synopsis PostgreSQL Query Optimization by : Henrietta Dombrovskaya
Download or read book PostgreSQL Query Optimization written by Henrietta Dombrovskaya and published by Apress. This book was released on 2021-05-27 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Write optimized queries. This book helps you write queries that perform fast and deliver results on time. You will learn that query optimization is not a dark art practiced by a small, secretive cabal of sorcerers. Any motivated professional can learn to write efficient queries from the get-go and capably optimize existing queries. You will learn to look at the process of writing a query from the database engine’s point of view, and know how to think like the database optimizer. The book begins with a discussion of what a performant system is and progresses to measuring performance and setting performance goals. It introduces different classes of queries and optimization techniques suitable to each, such as the use of indexes and specific join algorithms. You will learn to read and understand query execution plans along with techniques for influencing those plans for better performance. The book also covers advanced topics such as the use of functions and procedures, dynamic SQL, and generated queries. All of these techniques are then used together to produce performant applications, avoiding the pitfalls of object-relational mappers. What You Will Learn Identify optimization goals in OLTP and OLAP systems Read and understand PostgreSQL execution plans Distinguish between short queries and long queries Choose the right optimization technique for each query type Identify indexes that will improve query performance Optimize full table scans Avoid the pitfalls of object-relational mapping systems Optimize the entire application rather than just database queries Who This Book Is For IT professionals working in PostgreSQL who want to develop performant and scalable applications, anyone whose job title contains the words “database developer” or “database administrator" or who is a backend developer charged with programming database calls, and system architects involved in the overall design of application systems running against a PostgreSQL database
Book Synopsis SQL Server Query Performance Tuning by : Grant Fritchey
Download or read book SQL Server Query Performance Tuning written by Grant Fritchey and published by Apress. This book was released on 2014-09-16 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: Queries not running fast enough? Wondering about the in-memory database features in 2014? Tired of phone calls from frustrated users? Grant Fritchey’s book SQL Server Query Performance Tuning is the answer to your SQL Server query performance problems. The book is revised to cover the very latest in performance optimization features and techniques, especially including the newly-added, in-memory database features formerly known under the code name Project Hekaton. This book provides the tools you need to approach your queries with performance in mind. SQL Server Query Performance Tuning leads you through understanding the causes of poor performance, how to identify them, and how to fix them. You’ll learn to be proactive in establishing performance baselines using tools like Performance Monitor and Extended Events. You’ll learn to recognize bottlenecks and defuse them before the phone rings. You’ll learn some quick solutions too, but emphasis is on designing for performance and getting it right, and upon heading off trouble before it occurs. Delight your users. Silence that ringing phone. Put the principles and lessons from SQL Server Query Performance Tuning into practice today. Covers the in-memory features from Project Hekaton Helps establish performance baselines and monitor against them Guides in troubleshooting and eliminating of bottlenecks that frustrate users
Download or read book SQL Tuning written by Dan Tow and published by "O'Reilly Media, Inc.". This book was released on 2003-11-19 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: A poorly performing database application not only costs users time, but also has an impact on other applications running on the same computer or the same network. SQL Tuning provides an essential next step for SQL developers and database administrators who want to extend their SQL tuning expertise and get the most from their database applications.There are two basic issues to focus on when tuning SQL: how to find and interpret the execution plan of an SQL statement and how to change SQL to get a specific alternate execution plan. SQL Tuning provides answers to these questions and addresses a third issue that's even more important: how to find the optimal execution plan for the query to use.Author Dan Tow outlines a timesaving method he's developed for finding the optimum execution plan--rapidly and systematically--regardless of the complexity of the SQL or the database platform being used. You'll learn how to understand and control SQL execution plans and how to diagram SQL queries to deduce the best execution plan for a query. Key chapters in the book include exercises to reinforce the concepts you've learned. SQL Tuning concludes by addressing special concerns and unique solutions to "unsolvable problems."Whether you are a programmer who develops SQL-based applications or a database administrator or other who troubleshoots poorly tuned applications, SQL Tuning will arm you with a reliable and deterministic method for tuning your SQL queries to gain optimal performance.
Download or read book T-SQL Querying written by Itzik Ben-Gan and published by Microsoft Press. This book was released on 2015-02-17 with total page 865 pages. Available in PDF, EPUB and Kindle. Book excerpt: T-SQL insiders help you tackle your toughest queries and query-tuning problems Squeeze maximum performance and efficiency from every T-SQL query you write or tune. Four leading experts take an in-depth look at T-SQL’s internal architecture and offer advanced practical techniques for optimizing response time and resource usage. Emphasizing a correct understanding of the language and its foundations, the authors present unique solutions they have spent years developing and refining. All code and techniques are fully updated to reflect new T-SQL enhancements in Microsoft SQL Server 2014 and SQL Server 2012. Write faster, more efficient T-SQL code: Move from procedural programming to the language of sets and logic Master an efficient top-down tuning methodology Assess algorithmic complexity to predict performance Compare data aggregation techniques, including new grouping sets Efficiently perform data-analysis calculations Make the most of T-SQL’s optimized bulk import tools Avoid date/time pitfalls that lead to buggy, poorly performing code Create optimized BI statistical queries without additional software Use programmable objects to accelerate queries Unlock major performance improvements with In-Memory OLTP Master useful and elegant approaches to manipulating graphs About This Book For experienced T-SQL practitioners Includes coverage updated from Inside Microsoft SQL Server 2008 T-SQL Querying and Inside Microsoft SQL Server 2008 T-SQL Programming Valuable to developers, DBAs, BI professionals, and data scientists Covers many MCSE 70-464 and MCSA/MCSE 70-461 exam topics
Author :Luis Sánchez Planell Publisher :Springer Science & Business Media ISBN 13 :9788407002254 Total Pages :290 pages Book Rating :4.0/5 (22 download)
Book Synopsis Dissociative States by : Luis Sánchez Planell
Download or read book Dissociative States written by Luis Sánchez Planell and published by Springer Science & Business Media. This book was released on 2000-12-21 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Constraint Databases and Applications by : Bart Kuijpers
Download or read book Constraint Databases and Applications written by Bart Kuijpers and published by Springer. This book was released on 2004-10-14 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ?rst International Symposium on the Applications of Constraint Databases (CDB2004) took place in Paris, France, on June 12–13, 2004, just before the ACM SIGMOD and PODS conferences. Since the publication of the paper “Constraint Query Languages” by Kan- lakis, Kuper and Revesz in 1990, the last decade has seen a growing interest in constraint database theory, query evaluation, and applications, re?ected in a variety of conferences, journals, and books. Constraint databases have proven to be extremely ?exible and adoptable in environments that relational database systems cannot serve well, such as geographic information systems and bioinf- matics. This symposium brought together people from several diverse areas all c- tributing to the practice and the application of constraint databases. It was a continuation and extension of previous workshops held in Friedrichshafen, G- many (1995), Cambridge, USA (1996), Delphi, Greece (1997), and Seattle, USA (1998) as well as of the work in the comprehensive volume “Constraint Data- ses” edited by G. Kuper, L. Libkin and J. Paredaens (2000) and the textbook “Introduction to Constraint Databases” by P. Revesz (2002). The aim of the symposium was to open new and future directions in c- straint database research; to address constraints over domains other than the reals; to contribute to a better implementation of constraint database systems, in particular of query evaluation; to address e?cient quanti?er elimination; and to describe applications of constraint databases.
Book Synopsis Skylines and Other Dominance-Based Queries by : Apostolos N. Papadopoulos
Download or read book Skylines and Other Dominance-Based Queries written by Apostolos N. Papadopoulos and published by Springer Nature. This book was released on 2022-06-01 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a gentle introduction to dominance-based query processing techniques and their applications. The book aims to present fundamental as well as some advanced issues in the area in a precise, but easy-to-follow, manner. Dominance is an intuitive concept that can be used in many different ways in diverse application domains. The concept of dominance is based on the values of the attributes of each object. An object dominates another object if is better than . This goodness criterion may differ from one user to another. However, all decisions boil down to the minimization or maximization of attribute values. In this book, we will explore algorithms and applications related to dominance-based query processing. The concept of dominance has a long history in finance and multi-criteria optimization. However, the introduction of the concept to the database community in 2001 inspired many researchers to contribute to the area. Therefore, many algorithmic techniques have been proposed for the efficient processing of dominance-based queries, such as skyline queries, -dominant queries, and top- dominating queries, just to name a few.
Book Synopsis Preferences and Similarities by : Giacomo Riccia
Download or read book Preferences and Similarities written by Giacomo Riccia and published by Springer Science & Business Media. This book was released on 2009-06-23 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fields of similarity and preference are still broadening due to the exploration of new fields of application. This is caused by the strong impact of vagueness, imprecision, uncertainty and dominance on human and agent information, communication, planning, decision, action, and control as well as by the technical progress of the information technology itself. The topics treated in this book are of interest to computer scientists, statisticians, operations researchers, experts in AI, cognitive psychologists and economists.
Book Synopsis Algorithmic Decision Theory by : Dimitris Fotakis
Download or read book Algorithmic Decision Theory written by Dimitris Fotakis and published by Springer Nature. This book was released on 2021-10-27 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the conference proceedings of the 7th International Conference on Algorithmic Decision Theory, ADT 2021, held in Toulouse, France, in November 2021. The 27 full papers presented were carefully selected from 58 submissions. The papers focus on algorithmic decision theory broadly defined, seeking to bring together researchers and practitioners coming from diverse areas of computer science, economics and operations research in order to improve the theory and practice of modern decision support.
Book Synopsis Comparative Decision-Making Analysis by : Philip H. Crowley
Download or read book Comparative Decision-Making Analysis written by Philip H. Crowley and published by Oxford University Press. This book was released on 2013-03-21 with total page 523 pages. Available in PDF, EPUB and Kindle. Book excerpt: Decisions are made by individual humans-but also by corporations, plants, robots, and computer programs. The authors of this volume help initiate a powerful new comparative dimension for our analysis and application of decision making across an enormous range of intellectual enquiry.
Book Synopsis Data Management in Grid and Peer-to-Peer Systems by : Abdelkader Hameurlain
Download or read book Data Management in Grid and Peer-to-Peer Systems written by Abdelkader Hameurlain and published by Springer Science & Business Media. This book was released on 2009-08-17 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the Second International Conference on Data Management in Grid and P2P Systems, Globe 2009, held in Linz, Austria, in September 2009. The 9 revised full papers presented were carefully reviewed and selected from 18 submissions. The papers are organized in topical sections on grid systems, querying in P2P systems, privacy protection for P2P systems, and semantic for P2P systems and applications.
Book Synopsis Algorithmic Decision Theory by : Patrice Perny
Download or read book Algorithmic Decision Theory written by Patrice Perny and published by Springer. This book was released on 2013-10-28 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the thoroughly refereed conference proceedings of the Third International Conference on Algorithmic Decision Theory, ADT 2013, held in November 2013 in Bruxelles, Belgium. The 33 revised full papers presented were carefully selected from more than 70 submissions, covering preferences in reasoning and decision making, uncertainty and robustness in decision making, multi-criteria decision analysis and optimization, collective decision making, learning and knowledge extraction for decision support.
Book Synopsis Specification and Optimization of Preference (SV- )Grouping Queries by : Markus Endres
Download or read book Specification and Optimization of Preference (SV- )Grouping Queries written by Markus Endres and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Algorithmic Decision Theory by : Jörg Rothe
Download or read book Algorithmic Decision Theory written by Jörg Rothe and published by Springer. This book was released on 2017-10-13 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the conference proceedings of the 5th International Conference on Algorithmic Decision Theory , ADT 2017, held in Luxembourg, in October 2017.The 22 full papers presented together with 6 short papers, 4 keynote abstracts, and 6 Doctoral Consortium papers, were carefully selected from 45 submissions. The papers are organized in topical sections on preferences and multi-criteria decision aiding; decision making and voting; game theory and decision theory; and allocation and matching.
Book Synopsis Advanced Hybrid Information Processing by : Weina Fu
Download or read book Advanced Hybrid Information Processing written by Weina Fu and published by Springer Nature. This book was released on 2023-03-21 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt: This two-volume set constitutes the post-conference proceedings of the 6th EAI International Conference on Advanced Hybrid Information Processing, ADHIP 2022, held in Changsha, China, in September 29-30, 2022. The 109 full papers presented were selected from 276 submissions and focus on theory and application of hybrid information processing technology for smarter and more effective research and application. The theme of ADHIP 2022 was Hybrid Information Processing in Meta World. The papers are named in topical sections as follows: Information Extracting and Processing in Digital World; Education Based methods in Learning and Teaching; Various Systems for Digital World.
