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Oracle Database 2 Day + Performance Tuning Guide 11g Release 2 (11.2)-176
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Oracle® Database
2 Day + Performance Tuning Guide
11g Release 2 (11.2)
E10822-04
November 2011
Oracle Database 2 Day + Performance Tuning Guide, 11g Release 2 (11.2)
E10822-04
Copyright © 2007, 2011, Oracle and/or its affiliates. All rights reserved.
Primary Authors: David McDermid, Lance Ashdown, Immanuel Chan
Contributing Author: Sushil Kumar
Contributors: Pete Belknap, Supiti Buranawatanachoke, Nancy Chen, Kakali Das, Karl Dias, Mike Feng,
Yong Feng, Cecilia Grant, Connie Green, William Hodak, Andrew Holdsworth, Kevin Jernigan, Caroline
Johnston, Sue K. Lee, Herve Lejeune, Colin McGregor, Mughees Minhas, Valarie Moore, Deborah Owens,
Mark Ramacher, Uri Shaft, Susan Shepard, Janet Stern, Hsiao-Te Su, Minde Sun, Mark Townsend, Stephen
Wexler, Graham Wood, Khaled Yagoub, Michael Zampiceni
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v
Contents
Preface ................................................................................................................................................................. xi
Audience....................................................................................................................................................... xi
Documentation Accessibility..................................................................................................................... xi
Related Documents .................................................................................................................................... xii
Conventions ................................................................................................................................................ xii
Part I Getting Started
1 Introduction
About This Guide..................................................................................................................................... 1-1
Common Oracle DBA Tasks................................................................................................................... 1-1
Tools for Tuning the Database ............................................................................................................... 1-2
2 Oracle Database Performance Method
Gathering Database Statistics Using the Automatic Workload Repository ................................. 2-1
Time Model Statistics......................................................................................................................... 2-2
Wait Event Statistics .......................................................................................................................... 2-4
Session and System Statistics............................................................................................................ 2-4
Active Session History Statistics...................................................................................................... 2-4
High-Load SQL Statistics.................................................................................................................. 2-5
Using the Oracle Performance Method................................................................................................ 2-5
Preparing the Database for Tuning ................................................................................................. 2-5
Tuning the Database Proactively..................................................................................................... 2-6
Tuning the Database Reactively....................................................................................................... 2-7
Tuning SQL Statements..................................................................................................................... 2-7
Common Performance Problems Found in Oracle Databases ........................................................ 2-8
Part II Proactive Database Tuning
3 Automatic Database Performance Monitoring
Overview of Automatic Database Diagnostic Monitor .................................................................... 3-1
ADDM Analysis ................................................................................................................................. 3-2
ADDM Recommendations................................................................................................................ 3-2
ADDM for Oracle Real Application Clusters................................................................................. 3-3
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