SQL Tuning View Larger Image | Dan Tow
O'Reilly Media, Paperback, Published November 2003, 314 pages, ISBN 0596005733 | List Price: $39.95
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A poorly performing database application not only costs users time, but also
has an impact on other applications running on the same computer or the same
network. SQL Tuning provides an essential next step for SQL developers
and database administrators who want to extend their SQL tuning expertise and
get the most from their database applications.
There are two basic issues to focus on when tuning SQL: how to find and interpret
the execution plan of an SQL statement and how to change SQL to get a specific
alternate execution plan. SQL Tuning provides answers to these questions
and addresses a third issue that's even more important: how to find the optimal
execution plan for the query to use.
Author Dan Tow outlines a timesaving method he's developed for finding the optimum
execution plan--rapidly and systematically--regardless of the complexity of
the SQL or the database platform being used. You'll learn how to understand
and control SQL execution plans and how to diagram SQL queries to deduce the
best execution plan for a query. Key chapters in the book include exercises
to reinforce the concepts you've learned. SQL Tuning concludes by addressing
special concerns and unique solutions to "unsolvable problems."
Whether you are a programmer who develops SQL-based applications or a database
administrator or other who troubleshoots poorly tuned applications, SQL Tuning
will arm you with a reliable and deterministic method for tuning your SQL queries
to gain optimal performance.
Table of Contents
Foreword
Preface
1. Introduction
Why Tune SQL?
Who Should Tune SQL?
How This Book Can Help
A Bonus
Outside-the-Box Solutions
2. Data-Access Basics
Caching in the Database
Tables
Indexes
Uncommon Database Objects
Single-Table Access Paths
Calculating Selectivity
Joins
3. Viewing and Interpreting Execution Plans
Reading Oracle Execution Plans
Reading DB2 Execution Plans
Reading SQL Server Execution Plans
4. Controlling Execution Plans
Universal Techniques for Controlling Plans
Controlling Plans on Oracle
Controlling Plans on DB2
Controlling Plans on SQL Server
5. Diagramming Simple SQL Queries
Why a New Method?
Full Query Diagrams
Interpreting Query Diagrams
Simplified Query Diagrams
Exercises
6. Deducing the Best Execution Plan
Robust Execution Plans
Standard Heuristic Join Order
Simple Examples
A Special Case
A Complex Example
Special Rules for Special Cases
Exercise
7. Diagramming and Tuning Complex SQL Queries
Abnormal Join Diagrams
Queries with Subqueries
Queries with Views
Queries with Set Operations
Exercise
8. Why the Diagramming Method Works
The Case for Nested Loops
Choosing the Driving Table
Choosing the Next Table to Join
Summary
9. Special Cases
Outer Joins
Merged Join and Filter Indexes
Missing Indexes
Unfiltered Joins
Unsolvable Problems
10. Outside-the-Box Solutions to Seemingly Unsolvable Problems
When Very Fast Is Not Fast Enough
Queries that Return Data from Too Many Rows
Tuned Queries that Return Few Rows, Slowly
A. Exercise Solutions
B. The Full Process, End to End
Glossary
Index
Customer Reviews
Customer Reviews: 2 Average Customer Rating: Jun 29, 2007 Seth W from San Francisco, CA
Required reading for enterprise software developers
Preempt the DBA from wondering "who the hell wrote this mess?", when your query grinds to a halt on a production database. This book describes a simple diagramming technique that generates an optimal execution plan for your crazy SQL. You can then steer your particular database toward the execution plan. As a side effect you will better understand and be able to simplify and optimize your query. The technique is grounded in, but abstracts, deep knowledge of how the database executes queries, which the author is very careful to explain in justifying why the technique works. Also provides specific troubleshooting tips for perverse query patterns that unfortunately crop up quite often in complex systems.
Oct 27, 2004 jeff thomas from Virginia
a really insightful and useful reference
-- no regrets buying this one -- can't believe i'm the first to review
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