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Stuck with bugs, performance problems, crashes, data corruption, and puzzling output? If you’re a database programmer or DBA, they’re part of your life. The trick is knowing how to quickly recover from them. This unique, example-packed book shows you how to handle an array of vexing problems when working with MySQL. Written by a principal technical support engineer at Oracle, MySQL Troubleshooting provides the background, tools, and expert steps for solving problems from simple to complex-whether data you thought you inserted doesn’t turn up in a query, or the entire database is corrupt because of a server failure. With this book in hand, you’ll work with more confidence.     Understand the source of a problem, even when the solution is simple     Handle problems that occur when applications run in multiple threads     Debug and fix problems caused by configuration options     Discover how operating system tuning can affect your server     Use troubleshooting techniques specific to replication issues     Get a reference to additional troubleshooting techniques and tools, including third-party solutions     Learn best practices for safe and effective troubleshooting-and for preventing problems About the Author Sveta Smirnova is a Principal Technical Support Engineer in the BugsAnalysis Support Group at MySQL at Oracle. She works on trickysupport issues and MySQL software bugs on a daily basis. Before starting at MySQL in 2006, she worked as web developer on severalclosed CRM systems. She is an active participant in the open sourcecommunity. Her main interests in recent years is solving DBA problems and finding ways to semi-automate this process. Table of Contents Chapter 1 Basics     Incorrect Syntax     Wrong Results from a SELECT     When the Problem May Have Been a Previous Update     Getting Information About a Query     Tracing Back Errors in Data     Slow Queries     When the Server Does Not Answer     Issues with Solutions Specific to Storage Engines     Permission Issues Chapter 2 You Are Not Alone: Concurrency Issues     Locks and Transactions     Locks     Transactions     Metadata Locking     How Concurrency Affects Performance     Other Locking Issues     Replication and Concurrency     Effectively Using MySQL Troubleshooting Tools Chapter 3 Effects of Server Options     Service Options     Variables That Are Supposed to Change the Server Behavior     Options That Limit Hardware Resources     Using the - no-defaults Option     Performance Options     Haste Makes Waste     The SET Statement     How to Check Whether Changes Had an Effect     Descriptions of Variables Chapter 4 MySQL’s Environment     Physical Hardware Limits     Operating System Limits     Effects of Other Software Chapter 5 Troubleshooting Replication     Displaying Slave Status     Problems with the I/O Thread     Problems with the SQL Thread Chapter 6 Troubleshooting Techniques and Tools     The Query     Effects of the Environment     Sandboxes     Errors and Logs     Information-Gathering Tools     Localizing the Problem (Minimizing the Test Case)     General Steps to Take in Troubleshooting     Testing Methods     Special Testing Tools     Maintenance Tools Chapter 7 Best Practices     Backups     Gathering the Information You Need     Testing     Prevention     Think About It! Appendix Information Resources     Resources Containing Information That Is Usually Useful     Bug and Knowledge Databases     Expert Knowledge Online     Places Where You Can Ask for Help     Books Colophon