Microsoft SQL Server 2014 Query Tuning & Optimization summary

Understanding Query Optimization

In Microsoft SQL Server 2014 Query Tuning & Optimization by Benjamin Nevarez, we begin by understanding the fundamental concepts of query optimization. The author introduces us to the query processor and the steps it takes to process a query. We learn about the query optimizer, its role in generating execution plans, and the different types of execution plans. The author also outlines the factors that influence the query optimizer's decisions.

Next, we delve into the query execution process, starting with the parsing and binding phase, followed by the optimization phase, and finally, the execution phase. We explore the different operators used in execution plans, such as scans, seeks, and joins, and understand their impact on query performance. The author emphasizes the importance of understanding these operators to effectively tune and optimize queries.

Query Troubleshooting and Tuning

The book then shifts its focus to query troubleshooting. Benjamin Nevarez introduces us to various tools and techniques for monitoring and troubleshooting query performance. We learn about Extended Events, SQL Trace, Dynamic Management Views (DMVs), and the Data Collector, and how these tools can be used to identify and resolve performance issues.

With a solid understanding of query processing and troubleshooting in place, we then move on to query tuning. The author discusses the different strategies for improving query performance, including indexing, statistics, and query hints. We learn how to create and maintain effective indexes and statistics to provide the query optimizer with accurate and useful information.

Maximizing Query Performance

In the next part of the book, we explore advanced techniques for maximizing query performance. The author introduces us to the new features in SQL Server 2014, such as In-Memory OLTP (Hekaton) and Columnstore indexes, and explains how these features can be leveraged to improve query performance for specific workloads.

We then focus on understanding and managing plan caching and reuse. We learn about the different types of caches in SQL Server, how plans are cached and reused, and the methods for monitoring and promoting plan caching and reuse to improve overall application performance.

Optimizing for Data Warehousing

As we near the end of Microsoft SQL Server 2014 Query Tuning & Optimization, the author shifts the discussion towards optimizing queries for data warehousing. We explore the unique challenges and requirements of data warehousing workloads and understand how to use columnstore indexes and other strategies to improve query performance in this context.

Lastly, the book covers the limitations of the query processor and how to handle them using hints and other methods. We learn about the various query hints available in SQL Server and when and how to use them effectively to influence the query optimizer's decisions.

Conclusion and Key Takeaways

In conclusion, Microsoft SQL Server 2014 Query Tuning & Optimization provides a comprehensive guide to understanding, troubleshooting, and optimizing query performance in SQL Server 2014. We develop a thorough understanding of the query optimization process, learn how to effectively troubleshoot and tune queries, and explore advanced techniques for maximizing query performance.

Key takeaways from the book include the importance of providing the query optimizer with accurate information, the significance of understanding query operators and execution plans, and the different strategies for improving query performance in various workloads. By the end of the book, readers are equipped with the knowledge and tools to effectively tune and optimize queries for better performance in SQL Server 2014.