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Oracle Database Problem Solving and Troubleshooting Handbook

Oracle Database Problem Solving and Troubleshooting Handbook

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  • Copyright 2016
  • Dimensions: 7" x 9-1/8"
  • Edition: 1st
  • eBook (Watermarked)
  • ISBN-10: 0-13-442927-3
  • ISBN-13: 978-0-13-442927-4

An Expert Guide for Solving Complex Oracle Database Problems

Oracle Database Problem Solving and Troubleshooting Handbook delivers comprehensive, practical, and up-to-date advice for running the Oracle Database reliably and efficiently in complex production environments. Seven leading Oracle experts have brought together an unmatched collection of proven solutions, hands-on examples, and step-by-step tips for Oracle Database 12c, 11g, and other recent versions of Oracle Database. Every solution is crafted to help experienced Oracle DBAs and DMAs understand and fix serious problems as rapidly as possible.

The authors cover LOB segments, UNDO tablespaces, high GC buffer wait events, poor query response times, latch contention, indexing, XA distributed transactions, RMAN backup/recovery, and much more. They also offer in-depth coverage of a wide range of topics, including DDL optimization, VLDB tuning, database forensics, adaptive cursor sharing, data pumps, data migration, SSDs, indexes, and how to go about fixing Oracle RAC problems.

Learn how to

  • Choose the quickest path to solve high-impact problems
  • Use modern best practices to make your day more efficient and predictable
  • Construct your “Call 9-1-1 plan” for future database emergencies
  • Proactively perform maintenance to improve your environment’s stability
  • Save time with industry-standard tools and scripts

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Table of Contents

Preface xix

Acknowledgments xxi

About the Authors xxv

About the Technical Reviewers and Contributors xxix

Chapter 1: Troubleshooting and Tuning LOB Segment Performance 1

Introduction to the LOB Datatype 1


The Impact of PCTFREE on LOBs 14

Overcoming Poor INSERT Performance 17

Summary 17

Chapter 2:  Overcoming Undo Tablespace Corruption 19

Overview of Undo Management 19

DTP, XA, and Rollback Segments 22

Recovering from Undo Tablespace Corruption 24

Summary 32

Chapter 3: Handling GC Buffer Busy Wait Events 35

Overview of Buffer Busy Wait Events 35

Leveraging the ORAchk Utility 36

Isolating GC Buffer Busy Waits 40

Isolating GC Buffer Busy Wait Event Issues 45

Fixes for GC Buffer Busy Waits 49

Summary 50

Chapter 4: Adaptive Cursor Sharing 51

ACS Working Algorithm 52

ACS in Action 58

ACS Bind-Awareness Monitoring 61

The Bind-Aware Cursor 73

A Practical Case 76

Summary 81

Chapter 5: Stabilizing Query Response Time Using SQL Plan Management 83

Getting Started 83

Creating a SQL Plan Baseline 87

Faking Baselines 92

Oracle Optimizer and SPM Interaction 96

SQL Plan Baseline Reproducibility 108

NLS_SORT and SQL Plan Baseline Reproducibility 114


Adaptive Cursor Sharing and SPM 122

Summary 131

Chapter 6: DDL Optimization Tips, Techniques, and Tricks 133

DLL Optimization Concept 133

The DDL Optimization Mechanism 136

DDL Optimization for NULL Columns 147

Summary 152

Chapter 7: Managing, Optimizing, and Tuning VLDBs 153

Overview of Very Large Databases 153

Optimal Basic Confi guration 154

VLDB Performance Tuning Principles 162

Gathering Optimizer Statistics 166

Backup and Recovery Best Practices 170

Summary 172

Chapter 8: Best Practices for Backup and Recovery with Recovery Manager 173

A Perfect Backup and Recovery Plan 173

An Overview of RMAN 174

Tips for Database Backup Strategies 175

Validating RMAN Backups 186

Backup Optimization and Tuning 187

Using RMAN for RAC Databases 189

Retaining Data in a Recovery Catalog 191

Having a Robust Recovery Strategy 192

Leveraging the Data Recovery Advisor 193

Summary 194

Chapter 9: Database Forensics and Tuning Using AWR Analysis: Part I 197

What Is AWR? 197

Knowing What to Look For 199

Header Section 199

RAC-Specific Pages 208

Time Model Statistics 211

Operating System Statistics 212

The SQL Sections 217

Instance Activity Statistics 221

Summary 233

Chapter 10: Database Forensics and Tuning Using AWR Analysis: Part II 235

Tablespace I/O Statistics 235

Buffer Pool Statistics 237

PGA Statistics 240

Shared Pool Statistics 244

Other Advisories 245

Buffer Waits Statistics 247

Enqueue Statistics 248

Undo Segment Statistics 250

Latch Statistics 251

Segment Access Areas 255

Library Cache Activity Sections 257

Dynamic Memory Components Sections 260

Process Memory Sections 262

Streams Component Sections 264

Resource Limits Statistics 266

Initialization Parameter Changes 267

Global Enqueue and Other RAC Sections 268

Summary 273

Chapter 11: Troubleshooting Problematic Scenarios in RAC 275

Troubleshooting and Tuning RAC 276

A Well-Oiled RAC Ecosystem 279

Troubleshooting RAC with OEM 12c 282

Utilities and Commands for Troubleshooting 283

Summary 288

Chapter 12: Leveraging SQL Advisors to Analyze and Fix SQL Problems 289

OEM 12c—SQL Advisors Home 290

SQL Tuning Advisor 290

SQL Access Advisor 295

SQL Repair Advisor 300

SQL Performance Analyzer 301

Summary 302

Chapter 13: Extending Data Pump for Data and Object Migration 303

Using Data Pump 303

Working with Private and Public Objects 306

Finding Valid INCLUDE and EXCLUDE Values 309

Exporting Subsets of Data 310

Changing Object Properties 313

Using PL/SQL API with Data Pump 317

Monitoring and Altering Resources 319

Improving Performance 320

Upgrading Databases 321

Summary 322

Chapter 14: Strategies for Migrating Data Quickly between Databases 323

Why Bother Migrating? 324

Determining the Best Strategy 324

Considering What Data to Migrate 326

Data Migration Methods 327

Summary 352

Chapter 15: Diagnosing and Recovering from TEMPFILE I/O Issues 353

Overview of Temporary Tablespaces 353

Correcting TEMPFILE I/O Waits 359

Summary 365

Chapter 16: Dealing with Latch and Mutex Contention 367

Overview of Latch and Mutex Architecture 367

Measuring Latch and Mutex Contention 371

Latch and Mutex Scenarios 375

Intractable Latch Contention 383

Summary 385

Chapter 17: Using SSDs to Solve I/O Bottlenecks 387

Disk Technologies: SSD versus HDD 388

The Oracle Database Flash Cache 395

Comparing SSD Options 402

Storage Tiering 410

Flash and Exadata 414

Summary 418

Chapter 18: Designing and Monitoring Indexes for Optimal Performance 421

Types of Indexes 421

Multiple Indexes on Identical Columns 431

Index Performance Issues 432

Summary 442

Chapter 19: Using SQLT to Boost Query Performance 445

Installing SQLT 446

Using the XTRACT Method 447

Using the XECUTE Method 448

Leveraging Other SQLT Methods 451

A Real-World Example 452

Summary 453

Chapter 20: Dealing with XA Distributed Transaction Issues 455

Repairing Common Distributed Transaction Issues 456

Repairing Ghost Distributed Transactions 457

Monitoring Distributed Transactions 462

Summary 464

Index 465


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