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Full Description
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.
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
