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Learn T-SQL Querying: A guide to developing efficient and elegant T-SQL code

Pedro Lopes

Lahoud

Free Trial

4.2 (9 Ratings)

Paperback May 2019 484 pages 1st Edition

Pedro Lopes

Lahoud

Free Trial

4.2 (9 Ratings)

Paperback May 2019 484 pages 1st Edition

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Key benefits

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

Description

Transact-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.

Who is this book 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.

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

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Product Details

Publication date : May 03, 2019

Length: 484 pages

Edition : 1st

Language : English

ISBN-13 : 9781789348811

Vendor :

Microsoft

Category :

Data

Languages :

SQL

Concepts :

Database Administration

Tools :

T-SQL

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17 Chapters

Section 1: Query Processing Fundamentals

Anatomy of a Query

Building blocks of a T-SQL statement

Logical statement processing flow

Summary

Understanding Query Processing

Query compilation essentials

Query optimization essentials

Query execution essentials

Plan caching and reuse

The importance of parameters

Summary

Mechanics of the Query Optimizer

Introducing the Cardinality Estimator

Understanding the query optimization workflow

Summary

Section 2: Dos and Donts of T-SQL

Exploring Query Execution Plans

Accessing a query plan

Navigating a query plan

Query plan operators of interest

Query plan properties of interest

Summary

Writing Elegant T-SQL Queries

Understanding predicate SARGability

Basic index guidelines

Best practices for T-SQL querying

Summary

Easily-Identified T-SQL Anti-Patterns

The perils of SELECT *

Functions in our predicate

Deconstructing table-valued functions

Complex expressions

Optimizing OR logic

NULL means unknown

Fuzzy string matching

Inequality logic

EXECUTE versus sp_executesql

Composable logic

Summary

Discovering T-SQL Anti-Patterns in Depth

Implicit conversions

Avoiding unnecessary sort operations

Avoiding UDF pitfalls

Avoiding unnecessary overhead with stored procedures

Pitfalls of complex views

Pitfalls of correlated sub-queries

Properly storing intermediate results

Summary

Section 3: Assemble Your Query Troubleshooting Toolbox

Building Diagnostic Queries Using DMVs and DMFs

Introducing Dynamic Management Views

Exploring query execution DMVs

Exploring query plan cache DMVs

Troubleshooting common scenarios with DMV queries

Summary

Building XEvent Profiler Traces

Introducing Extended Events

SQL Server Profiler – deprecated but not forgotten

Getting up and running with XEvent Profiler

Remote collection with PSSDiag and SQLDiag

Analyzing traces with RML Utilities

Summary

Comparative Analysis of Query Plans

Query Plan Comparison

Query Plan Analyzer

Summary

Tracking Performance History with Query Store

The Query Store

Tracking expensive queries

Fixing regressed queries

Summary

Troubleshooting Live Queries

Using Live Query Statistics

Understanding the need for Lightweight Profiling

Activity Monitor gets a new life

Summary

Managing Optimizer Changes with the Query Tuning Assistant

Understanding where QTA is needed

Understanding QTA fundamentals

Exploring the QTA workflow

Summary

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About the authors

Pedro Lopes

Pedro Lopes is a Program Manager in the Database Systems group, based in Redmond, WA, USA. He has over 19 years of industry experience and has been with Microsoft for 9 years. He is currently responsible for program management of Database Engine features for in-market and vNext versions of SQL Server, with a special focus on the Relational Engine. He has extensive experience with query performance troubleshooting and is a regular speaker at numerous conferences such as SQLBits, PASS Summit, SQLIntersection, Microsoft Ignite, and Microsoft Build. He blogs about SQL on the SQL Server Team blog. He has authored several tools in the Tiger toolbox on GitHub: AdaptiveIndexDefrag maintenance solution, BPCheck, and usp_WhatsUp.

See other products by Pedro Lopes

Lahoud

Pam Lahoud is a Program Manager in the Database Systems group, based in Redmond, WA, USA. She has been with Microsoft for 13 years and is currently responsible for program management of Database Engine features for in-market and vNext versions of SQL Server, with a special focus on the Storage Engine area. She is passionate about SQL Server performance and has focused on performance tuning and optimization, particularly from the developer's perspective, throughout her career. She is a SQL Server 2008 Microsoft Certified Master (MCM) with over 20 years of experience working with SQL Server.

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Learn T-SQL Querying: A guide to developing efficient and elegant T-SQL code

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