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Query Processing in Database Systems

Query Processing in Database Systems
Author: W. Kim
Publisher: Springer Science & Business Media
Total Pages: 367
Release: 2012-12-06
Genre: Computers
ISBN: 3642823750
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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.

Excel Power Pivot & Power Query For Dummies

Excel Power Pivot & Power Query For Dummies
Author: Michael Alexander
Publisher: John Wiley & Sons
Total Pages: 353
Release: 2016-03-18
Genre: Computers
ISBN: 1119210666
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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.

Query Understanding for Search Engines

Query Understanding for Search Engines
Author: Yi Chang
Publisher: Springer Nature
Total Pages: 224
Release: 2020-12-01
Genre: Computers
ISBN: 3030583341
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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.

CDI Workbook

CDI Workbook
Author: Sheila Duhon
Publisher:
Total Pages: 148
Release: 2018-09
Genre:
ISBN: 9781683088066
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T-SQL Querying

T-SQL Querying
Author: Itzik Ben-Gan
Publisher: Microsoft Press
Total Pages: 865
Release: 2015-02-17
Genre: Computers
ISBN: 0133986624
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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

Writing Irresistible Kidlit

Writing Irresistible Kidlit
Author: Mary Kole
Publisher: Penguin
Total Pages: 305
Release: 2012-12-04
Genre: Language Arts & Disciplines
ISBN: 1599635763
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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.

Learn T-SQL Querying

Learn T-SQL Querying
Author: Pedro Lopes
Publisher: Packt Publishing Ltd
Total Pages: 474
Release: 2019-05-03
Genre: Computers
ISBN: 178934297X
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Troubleshoot query performance issues, identify anti-patterns in code, and write efficient T-SQL queries Key Features Discover T-SQL functionalities and services that help you interact with relational databases Understand the roles, tasks, and responsibilities of a T-SQL developer Explore solutions for carrying out database querying tasks, database administration, and troubleshooting Book DescriptionTransact-SQL (T-SQL) is Microsoft's proprietary extension to the SQL language used with Microsoft SQL Server and Azure SQL Database. This book will be a usefu to learning the art of writing efficient T-SQL code in modern SQL Server versions as well as the Azure SQL Database. The book will get you started with query processing fundamentals to help you write powerful, performant T-SQL queries. You will then focus on query execution plans and leverage them for troubleshooting. In later chapters, you will explain how to identify various T-SQL patterns and anti-patterns. This will help you analyze execution plans to gain insights into current performance, and determine whether or not a query is scalable. You will also build diagnostic queries using dynamic management views (DMVs) and dynamic management functions (DMFs) to address various challenges in T-SQL execution. Next, you will work with the built-in tools of SQL Server to shorten the time taken to address query performance and scalability issues. In the concluding chapters, this will guide you through implementing various features, such as Extended Events, Query Store, and Query Tuning Assistant, using hands-on examples. By the end of the book, you will have developed the skills to determine query performance bottlenecks, avoid pitfalls, and discover the anti-patterns in use.What you will learn Use Query Store to understand and easily change query performance Recognize and eliminate bottlenecks that lead to slow performance Deploy quick fixes and long-term solutions to improve query performance Implement best practices to minimize performance risk using T-SQL Achieve optimal performance by ensuring careful query and index design Use the latest performance optimization features in SQL Server 2017 and SQL Server 2019 Protect query performance during upgrades to newer versions of SQL Server Who this book is for This book is for database administrators, database developers, data analysts, data scientists, and T-SQL practitioners who want to get started with writing T-SQL code and troubleshooting query performance issues with the help of practical examples. Previous knowledge of T-SQL querying is not required to get started with this book.

Bounded Queries in Recursion Theory

Bounded Queries in Recursion Theory
Author: William S. Levine
Publisher: Springer Science & Business Media
Total Pages: 372
Release: 1998-12-23
Genre: Computers
ISBN: 9780817639662
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One of the major concerns of theoretical computer science is the classifi cation of problems in terms of how hard they are. The natural measure of difficulty of a function is the amount of time needed to compute it (as a function of the length of the input). Other resources, such as space, have also been considered. In recursion theory, by contrast, a function is considered to be easy to compute if there exists some algorithm that computes it. We wish to classify functions that are hard, i.e., not computable, in a quantitative way. We cannot use time or space, since the functions are not even computable. We cannot use Turing degree, since this notion is not quantitative. Hence we need a new notion of complexity-much like time or spac~that is quantitative and yet in some way captures the level of difficulty (such as the Turing degree) of a function.

Notes and Queries

Notes and Queries
Author:
Publisher:
Total Pages: 524
Release: 1850
Genre: Questions and answers
ISBN:
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M Is for (Data) Monkey

M Is for (Data) Monkey
Author: Ken Puls
Publisher: Tickling Keys, Inc.
Total Pages: 298
Release: 2015-06-01
Genre: Computers
ISBN: 1615473459
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Power Query is one component of the Power BI (Business Intelligence) product from Microsoft, and "M" is the name of the programming language created by it. As more business intelligence pros begin using Power Pivot, they find that they do not have the Excel skills to clean the data in Excel; Power Query solves this problem. This book shows how to use the Power Query tool to get difficult data sets into both Excel and Power Pivot, and is solely devoted to Power Query dashboarding and reporting.