SQL Tuning

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by: Dan Tow

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On-line Price: $52.95 (includes GST) Paperback package 336 20%Off Retail Price You save: $13.00 Please call us to check availability	Retail Price: $65.95 Publisher: O'REILLY,2003/11/30 Category: SQL PROGRAMMING Level: ISBN: 0596005733 ISBN13: 9780596005733
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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.

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