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Performance Tuning with SQL Server Dynamic Management Views (High Performance Sql Server) ReviewYou know those technical manuals that sit on your desk, slowly collecting little post-it tabs with notes on them, the spines are cracked, the covers are wrinkled, when people come to borrow them you snatch it from their hands? You know those books? Yeah, well, this is one of them. I've only owned it for a few days, but I've already opened it several times to look stuff up, even stuff I had just finished reading.I really like the approach the authors, Louis Davidson & Tim Ford, took to the book. Instead of just laying out a bunch of Dynamic Management Objects (DMO) in alphabetical order or something, they focused on the DMOs associated with Performance Tuning. Then, they took the trouble to break the DMOs apart into different areas of data and performance metrics like "Query Plan MetaData" and "Transactions." They introduced each topic with an overview of the topic, why DMOs are useful to gathering data on that topic and then dived into which DMO did what to help you with the information you need to do performance tuning on your system.
The writing is very clear and to the point. Also, I wasn't able to detect different "voices" as I read through the book. Despite more than one author, there's not that disjointed feeling you can get as you hop from one chapter to another and switch authors at the same time. I really liked the sample queries and the way they built on each other, showing you the true strength available in DMOs, which is combining them to put together extremely useful views on the data in the system. I also liked the fonts used and the layout of the book, the way important code was called out through bolding & font changes. I did think that the screen captures were a bit fuzzy, but not to the degree that it detracted from the book in any way.
The argument can be made that books like this just rewrite the Books Online (BOL). But, in addition to extremely clear explanations, and a focused methodology showing you not just how to use the DMOs but where and why to use the DMOs, you also get the unique code samples. The thing about DMOs is that in isolation, they're useful. But it's in combination that they become powerful. The examples emphasize how these building blocks can be put together to create new, interesting and useful reports. Examples such as these are just not available in BOL.
For all these reasons, I highly recommend this book. If you're responsible for maintaining or developing SQL Server systems, you'll find something useful in this book that you can put to work, right away.Performance Tuning with SQL Server Dynamic Management Views (High Performance Sql Server) OverviewDynamic Management Views (DMVs) are a significant and valuable addition to the DBA's troubleshooting armory, laying bare previously unavailable information regarding the under-the-covers activity of your database sessions and transactions.Why, then, aren't all DBAs using them? Why do many DBAs continue to ignore them in favour of "tried and trusted" tools such as sp_who2, DBCC OPENTRAN, and so on, or make do with the "ready made" reports built into SSMS? Why do even those that do use the DMVs speak wistfully about "good old sysprocesses"?There seem to be two main factors at work. Firstly, some DBAs are simply unaware of the depth and breadth of the information that is available from the DMvs, or how it might help them troubleshoot common issues. This book investigates all of the DMVs that are most frequently useful to the DBA in investigating query execution, index usage, session and transaction activity, disk IO, and how SQL Server is using or abusing the operating system.Secondly, the DMVs have a reputation of being difficult to use. In the process of exposing as much useful data as possible, sysprocesses has been de-normalized, and many new views and columns have been added. This fact, coupled with the initially-baffling choices of what columns will be exposed where, has lead to some DBAs to liken querying DMVs to "collecting mystic spells".In fact, however, once you start to write your own scripts, you'll see the same tricks, and similar join patterns, being used time and again. As such, a relatively small core set of scripts can be readily adapted to suit any requirement. This book is here to de-mystify the process of collecting the information you need to troubleshoot SQL Server problems. It will highlight the core techniques and "patterns" that you need to master, and will provide a core set of scripts that you can use and adapt for your own systems, including how to:* Root out the queries that are causing memory or CPU pressure on your system* Investigate caching, and query plan reuse* Identify index usage patterns* Track fragmentation in clustered indexes and heaps* Get full details on blocking and blocked transactions, including the exact commands being executed, and by whom.* Find out where SQL Server is spending time waiting for resources to be released, before proceeding* Monitor usage and growth of tempdbThe DMVs don't make existing, built-in, performance tools obsolete. On the contrary, they complement these tools, and offer a flexibility, richness and granularity that are simply not available elsewhere. Furthermore, you don't need to master a new GUI, or a new language in order to use them; it's all done in a language all DBAs know and mostly love: T-SQL.
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