Book Image

SQL Server 2017 Developer???s Guide

Book Image

SQL Server 2017 Developer???s Guide

Overview of this book

Microsoft SQL Server 2017 is a milestone in Microsoft's data platform timeline, as it brings in the power of R and Python for machine learning and containerization-based deployment on Windows and Linux. This book prepares you for advanced topics by starting with a quick introduction to SQL Server 2017's new features. Then, it introduces you to enhancements in the Transact-SQL language and new database engine capabilities before switching to a different technology: JSON support. You will take a look at the security enhancements and temporal tables. Furthermore, the book focuses on implementing advanced topics, including Query Store, columnstore indexes, and In-Memory OLTP. Toward the end of the book, you'll be introduced to R and how to use the R language with Transact-SQL for data exploration and analysis. You'll also learn to integrate Python code into SQL Server and graph database implementations as well as the deployment options on Linux and SQL Server in containers for development and testing. By the end of this book, you will be armed to design efficient, high-performance database applications without any hassle.
Table of Contents (25 chapters)
Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
Free Chapter
1
Introduction to SQL Server 2017
Index

Chapter 10. Columnstore Indexes

Analytical queries that scan hugeamounts of data are alwaysproblematic in relational databases. Nonclustered balanced tree indexes are efficient for transactional query seeks; however, they rarely help with analytical queries. A great idea occurred nearly 30 years ago: why do we need to store data physically in the same way we work with it logically, row by row? Why don't we store it column by column and transform columns back into rows when we interact with the data? Microsoft played with this idea for a long time and finally implemented it in SQL Server.

Columnar storage was first added to SQL Server in the 2012 version. It included nonclustered columnstore indexes (NCCI) only. Clustered columnstore indexes (CCIs) were added in the 2014 version. In this chapter, readers can revise columnar storage and then explore huge improvements for columnstore indexes in SQL Server 2016 and 2017—updatable nonclustered columnstore indexes, columnstore indexes on in-memory...