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SQL Server 2017 Developer???s Guide

You're reading from SQL Server 2017 Developer???s Guide

Product type Book

Published in Mar 2018

Publisher Packt

ISBN-13 9781788476195

Pages 816 pages

Edition 1st Edition

Languages

Concepts

Database Programming

Table of Contents (25) Chapters

Title Page

Copyright and Credits

Dedication

Packt Upsell

Contributors

Preface

1. Introduction to SQL Server 2017

2. Review of SQL Server Features for Developers

3. SQL Server Tools

4. Transact-SQL and Database Engine Enhancements

5. JSON Support in SQL Server

6. Stretch Database

7. Temporal Tables

8. Tightening Security

9. Query Store

10. Columnstore Indexes

11. Introducing SQL Server In-Memory OLTP

12. In-Memory OLTP Improvements in SQL Server 2017

13. Supporting R in SQL Server

14. Data Exploration and Predictive Modeling with R

15. Introducing Python

16. Graph Database

17. Containers and SQL on Linux

1. Other Books You May Enjoy

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Index

Query Store architecture

Query Store is integrated with the query processor in the database engine. A simplified Query Store architecture in SQL Server 2017 is shown in the following figure:

Query Store architecture

Query Store actually has three stores:

Query and Plan Store: This stores information about executed queries and execution plans used for their execution
Runtime Statistics store: This store holds aggregated execution parameters (execution time, logical reads, and so on) for executed queries within a specified time
Wait Stats Store: This store persists wait statistics information

All three stores have instances in memory and persisted representation through disk tables. Due to performance reasons, captured info is not immediately written to disk; rather it is written asynchronously. Query Store physically stores this info into the database primary file group.

When a query is submitted to the database engine and Query Store is enabled for the database, during query compilation, Query...

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