Query Processing in Database Systems

2012-12-06 Computers

Author : W. Kim
Release : 2012-12-06
Genre : Computers
Kind : eBook
Book Rating : 750/5 ( reviews)

Book Synopsis Query Processing in Database Systems by : W. Kim

Download or read book Query Processing in Database Systems written by W. Kim. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: This book is an anthology of the results of research and development in database query processing during the past decade. The relational model of data provided tremendous impetus for research into query processing. Since a relational query does not specify access paths to the stored data, the database management system (DBMS) must provide an intelligent query-processing subsystem which will evaluate a number of potentially efficient strategies for processing the query and select the one that optimizes a given performance measure. The degree of sophistication of this subsystem, often called the optimizer, critically affects the performance of the DBMS. Research into query processing thus started has taken off in several directions during the past decade. The emergence of research into distributed databases has enormously complicated the tasks of the optimizer. In a distributed environment, the database may be partitioned into horizontal or vertical fragments of relations. Replicas of the fragments may be stored in different sites of a network and even migrate to other sites. The measure of performance of a query in a distributed system must include the communication cost between sites. To minimize communication costs for-queries involving multiple relations across multiple sites, optimizers may also have to consider semi-join techniques.

T-SQL Querying

2015-02-17 Computers

Author : Itzik Ben-Gan
Release : 2015-02-17
Genre : Computers
Kind : eBook
Book Rating : 624/5 ( reviews)

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Book Synopsis T-SQL Querying by : Itzik Ben-Gan

Download or read book T-SQL Querying written by Itzik Ben-Gan. This book was released on 2015-02-17. 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

Query Understanding for Search Engines

2020-12-01 Computers

Author : Yi Chang
Release : 2020-12-01
Genre : Computers
Kind : eBook
Book Rating : 341/5 ( reviews)

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Book Synopsis Query Understanding for Search Engines by : Yi Chang

Download or read book Query Understanding for Search Engines written by Yi Chang. This book was released on 2020-12-01. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a systematic study of practices and theories for query understanding of search engines. These studies can be categorized into three major classes. The first class is to figure out what the searcher wants by extracting semantic meaning from the searcher’s keywords, such as query classification, query tagging, and query intent understanding. The second class is to analyze search queries and then translate them into an enhanced query that can produce better search results, such as query spelling correction or query rewriting. The third class is to assist users in refining or suggesting queries in order to reduce users’ search effort and satisfy their information needs, such as query auto-completion and query suggestion. Query understanding is a fundamental part of search engines. It is responsible to precisely infer the intent of the query formulated by the search user, to correct spelling errors in his/her query, to reformulate the query to capture its intent more accurately, and to guide the user in formulating a query with precise intent. The book will be invaluable to researchers and graduate students in computer or information science and specializing in information retrieval or web-based systems, as well as to researchers and programmers working on the development or improvement of products related to search engines.

Excel Power Pivot & Power Query For Dummies

2016-03-18 Computers

Author : Michael Alexander
Release : 2016-03-18
Genre : Computers
Kind : eBook
Book Rating : 666/5 ( reviews)

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Book Synopsis Excel Power Pivot & Power Query For Dummies by : Michael Alexander

Download or read book Excel Power Pivot & Power Query For Dummies written by Michael Alexander. This book was released on 2016-03-18. Available in PDF, EPUB and Kindle. Book excerpt: A guide to PowerPivot and Power Query no data cruncher should be without! Want to familiarize yourself with the rich set of Microsoft Excel tools and reporting capabilities available from PowerPivot and Power Query? Look no further! Excel PowerPivot & Power Query For Dummies shows you how this powerful new set of tools can be leveraged to more effectively source and incorporate 'big data' Business Intelligence and Dashboard reports. You'll discover how PowerPivot and Power Query not only allow you to save time and simplify your processes, but also enable you to substantially enhance your data analysis and reporting capabilities. Gone are the days of relatively small amounts of data—today's data environment demands more from business analysts than ever before. Now, with the help of this friendly, hands-on guide, you'll learn to use PowerPivot and Power Query to expand your skill-set from the one-dimensional spreadsheet to new territories, like relational databases, data integration, and multi-dimensional reporting. Demonstrates how Power Query is used to discover, connect to, and import your data Shows you how to use PowerPivot to model data once it's been imported Offers guidance on using these tools to make analyzing data easier Written by a Microsoft MVP in the lighthearted, fun style you've come to expect from the For Dummies brand If you spend your days analyzing data, Excel PowerPivot & Power Query For Dummies will get you up and running with the rich set of Excel tools and reporting capabilities that will make your life—and work—easier.

Writing Irresistible Kidlit

2012-12-04 Language Arts & Disciplines

Author : Mary Kole
Release : 2012-12-04
Genre : Language Arts & Disciplines
Kind : eBook
Book Rating : 763/5 ( reviews)

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Book Synopsis Writing Irresistible Kidlit by : Mary Kole

Download or read book Writing Irresistible Kidlit written by Mary Kole. This book was released on 2012-12-04. Available in PDF, EPUB and Kindle. Book excerpt: Captivate the hearts and minds of young adult readers! Writing for young adult (YA) and middle grade (MG) audiences isn't just "kid's stuff" anymore--it's kidlit! The YA and MG book markets are healthier and more robust than ever, and that means the competition is fiercer, too. In Writing Irresistible Kidlit, literary agent Mary Kole shares her expertise on writing novels for young adult and middle grade readers and teaches you how to: • Recognize the differences between middle grade and young adult audiences and how it impacts your writing. • Tailor your manuscript's tone, length, and content to your readership. • Avoid common mistakes and cliches that are prevalent in YA and MG fiction, in respect to characters, story ideas, plot structure and more. • Develop themes and ideas in your novel that will strike emotional chords. Mary Kole's candid commentary and insightful observations, as well as a collection of book excerpts and personal insights from bestselling authors and editors who specialize in the children's book market, are invaluable tools for your kidlit career. If you want the skills, techniques, and know-how you need to craft memorable stories for teens and tweens, Writing Irresistible Kidlit can give them to you.

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Query Processing in Database Systems

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