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Pro SQL Server Wait Statistics, by Enrico van de Laar
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Pro SQL Server Wait Statistics is a practical guide for analyzing and troubleshooting SQL Server performance using wait statistics. Whether you are new to wait statistics, or already familiar with them, this book will help you gain a deeper understanding of how wait statistics are generated and what they can mean for your SQL Server’s performance.
Besides the most common wait types, Pro SQL Server Wait Statistics goes further into the more complex and performance threatening wait types. The different wait types are categorized by their area of impact, and include CPU, IO, Lock, and many more different wait type categories. Filled with clear examples, Pro SQL Server Wait Statistics helps you gain practical knowledge of why and how specific wait times increase or decrease, and how they impact your SQL Server’s performance.
What you’ll learn- How wait Statistics are generated by SQL Server
- Script examples for analyzing and tuning wait statistics
- How to lower, or even eliminate, wait times that hurt performance
- How to query wait statistics information from Dynamic Management Views
- How to build reliable and solid wait statistics baselines from which to detect performance issues
- Sales Rank: #1695593 in eBooks
- Published on: 2015-09-10
- Released on: 2015-09-10
- Format: Kindle eBook
About the Author
Enrico van de Laar is a database technology specialist with over a decade of experience with SQL Server. Enrico works for a Dutch IT company that specializes in building IT solutions for the Dutch healthcare sector, there he is responsible for maintaining and optimizing the databases of some of the largest hospitals in the Netherlands. Enrico is also the founder of DotNine SQL Server Training, a company that specializes in Microsoft SQL Server related training.
Enrico is a SQL Server MVP and his main specializations inside SQL Server are performance tuning and database architecture.
Most helpful customer reviews
0 of 0 people found the following review helpful.
Troubleshoot problems and improve the performance of SQL Server queries by using Wait Statistics
By Ian Stirk
Hi,
I have written a detailed chapter-by-chapter review of this book on www DOT i-programmer DOT info, the first and last parts of this review are given here. For my review of all chapters, search i-programmer DOT info for STIRK together with the book's title.
This book aims to troubleshoot problems and improve the performance of SQL Server queries by using Wait Statistics, how does it fare?
When SQL code is not running on the CPU, SQL Server records the reason why it is not running (e.g. blocking or waiting for IO to complete). Analysing these Wait Statistics (Wait Stats), and making changes based on them, can improve the performance of your queries.
The book is targeted at DBAs and SQL developers who want to troubleshoot problems and improve the performance of their SQL Servers and queries. There are 771 types of Wait Stats in SQL Server 2014, and the most common ones are discussed here.
The book assumes little specific knowledge about SQL Server; however, an understanding will make the book easier to read. The book contains three chapters relating to the Wait Stats analysis method, and nine chapters on wait types relating to specific areas of processing.
Below is a chapter-by-chapter exploration of the topics covered.
Part I Foundations of Wait Statistics Analysis
Chapter 1 Wait Statistics Internals
This chapter opens with a discussion on what Wait Stats are: they indicate why SQL code is not running on the CPUs. They are not well-known to DBAs or developers. A brief history of Wait Stats is given, having existed in earlier versions of SQL Server, they became more usable with the advent of Dynamic Management Views (DMVs) in SQL Server 2005.
The chapter continues with a look at SQLOS, which provides operating system (OS) functionality, allowing SQL Server to take advantage of hardware improvements. Next, schedulers, tasks, and worker threads are discussed, and their work illustrated with the use of DMVs.
The chapter ends with a look at Wait Stats and how they relate to the various queues (i.e. running, runnable, and waiter list). The movement of queries between the queues is shown with examples.
This chapter provides a useful overview of what Wait Stats are, together with the SQL Server OS architecture, and the flow between sessions, requests, tasks and threads. There’s a reference to Tom Davidson’s helpful paper “SQL Server 2005 Waits and Queues” - which is still applicable today.
I don’t agree with everything that’s said. The technique is not new, indeed Davidson’s related paper dates from 2006. Additionally, people that deal with performance tuning will be very familiar with Wait Stats, it’s a well-known tuning technique.
This chapter contains well written discussions, helpful references to websites, inter-chapter links, example SQL code to support the assertions, useful diagrams, outputs, and practical instructions. These traits apply to the book as a whole.
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Conclusion
This book contains well-written discussions, useful examples, SQL code, diagrams, website links, and inter-chapter links. It contains plenty of detailed information to help you troubleshoot your problems, and offers useful suggestions for solutions.
The book describes what Wait Stats are, how they can be recorded as a baseline, and how this baseline can be used to identify problems. The larger part of the book can be used as a reference, for you to decode your wait types, understand what they are, and how the wait type metrics can be lowered. You’re sure to learn a lot about the internal working of SQL Server from this book.
Sometimes, things are not how they initially seem e.g. high IO values might not mean the IO subsystem is slow, it might be there isn’t enough memory on the server. So, I would have liked to have seen a more corroborative approach between various tuning techniques (e.g. Davidson links Wait Stats with Perfmon queue metrics). Also, I felt sometimes there was too much hyperbole (e.g. Wait Stats is a relatively little used technique, and worthless without a baseline).
Despite these reservations, I enjoyed this book immensely, it contains lots of useful detail. It is certainly the next thing to read after Davidson’s paper on SQL Server 2005 Waits and Queues (available for free at: https://technet.microsoft.com/en-us/library/cc966413.aspx). The book is highly recommended.
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