Oracle SQL Tuning Pocket Reference

Mark Gurry

  • 出版商: O'Reilly Media
  • 出版日期: 2002-01-11
  • 定價: USD $9.95
  • 售價: $333
  • 貴賓價: 9.5$315
  • 語言: 英文
  • 頁數: 112
  • 裝訂: Paperback
  • ISBN: 0596002688
  • ISBN-13: 9780596002688

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產品描述

One of the most important challenges faced by Oracle database administrators and Oracle developers is the need to tune SQL statements so that they execute efficiently. Poorly tuned SQL statements are one of the leading causes of substandard database performance and poor response time. SQL statements that perform poorly result in frustration for users, and can even prevent a company from serving its customers in a timely manner.

In this book, Mark Gurry shares his in-depth knowledge of Oracle's SQL statement optimizers. Mark's knowledge is the result of many hard-fought tuning battles during his many years of providing Oracle tuning services to clients. Mark provides insights into the workings of the rule-based optimizer that go well beyond what the rules tell you. Mark also provides solutions to many common problems that occur with both the rule-based and cost-based optimizers.

In addition to the specific problem/solution scenarios for the optimizers, Mark provides a number of handy SQL tuning tips. He discusses the various optimizer hints, telling you when they can be used to good effect. Finally, Mark discusses the use of the DBMS_STATS package to manage database statistics, and the use of outlines to specify execution plans for SQL statements in third-party applications that you can't otherwise modify.

Table of Contents

     Introduction

     The SQL Optimizers
            Understanding the Rule-Based Optimizer
            Understanding the Cost-Based Optimizer
            Some Common Optimizer Misconceptions
            Which Optimizer to Use?

     Rule-Based Optimizer Problems and Solutions
            Problem 1: Incorrect Driving Table
            Problem 2: Incorrect Index
            Problem 3: Incorrect Driving Index
            Problem 4: Using the ORDER BY Index and notthe WHERE Index

     Cost-Based Optimizer Problems and Solutions
            Problem 1: The Skewness Problem
            Problem 2: Analyzing with Wrong Data
            Problem 3: Mixing the Optimizers in Joins
            Problem 4: Choosing an Inferior Index
            Problem 5: Joining Too Many Tables
            Problem 6: Incorrect INIT.ORA Parameter Settings

     Problems Common to Rule and Cost with Solutions
            Problem 1: Statement Not Written for Indexes
            Problem 2: Indexes Are Missing or Inappropriate
            Problem 3: Use of Single-Column Index Merge
            Problem 4: Misuse of Nested Loop, Sort Merge,or Hash Join
            Problem 5: Misuse of IN, EXISTS, NOT IN, NOT EXISTS,or Table Joins
            Problem 6: Unnecessary Sorts
            Problem 7: Too Many Indexes on a Table
            Problem 8: Use of OR Instead of UNION
            Problem 9: Tables and Indexes with Many Deletes
            Other Problems: Heavy Usage of Views
            Other Problems: Joining Too Many Tables

     Handy SQL Tuning Tips
            Identify Bad SQL
            Identify Long-Running SQL Statements
            Use DECODE for IF/ELSE Selection
            Encourage Bind Variables

     Using SQL Hints
            When Are Hints Ignored?
            Using Hints in Views
            Available Hints

     Using DBMS_STATS to Manage Statistics
            Using DBMS_STATS to Analyze Faster
            Copying Statistics Using DBMS_STATS
            Manipulating Statistics Using DBMS_STATS
            Reverting to Previous Statistics

     Using Outlines for Consistent Execution Plans
            Recording Outlines
            Enabling Outlines
            Managing Outlines