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MySQL Tutorial - Locks, Timeouts, and Deadlocks

By: FYIcenter.com

(Continued from previous topic...)

What Are Impacts on Applications from Locks, Timeouts, and DeadLocks?

If you are using transactions with REPEATABLE READ isolation level and transaction safe storage engines in your applications, data locks, lock timeouts, and dead lock detections will impact your application in a concurrent multi-user environment like Web sites in several ways:

  • Data Locks - Helping your application to maintain data integrity and keep each user session consistent. But data locks also slows down your applications, since one user session may need to wait for other sessions to release locks before continuing some data operations.

  • Lock Timeouts - Helping your application to avoid long waits and improve response time to user actions. But your application code must catch the lock timeout errors, and deal with them properly, like asking your user to cancel and restart the process.

  • Dead Lock Detections - Helping your application to avoid dead user sessions and improve response time to user actions. But your application code must catch the dead lock errors, and deal with them properly, like asking your user to cancel and restart the process.

  1. What Is a Transaction?
  2. How To Start a New Transaction?
  3. How To End the Current Transaction?
  4. How To Create a Table for Transaction Testing?
  5. How To Switch between Autocommit-On and Autocommit-Off Modes?
  6. How To Find Out the Current Transaction Mode?
  7. How To Start a New Transaction Explicitly?
  8. How To Commit the Current Transaction?
  9. How To Rollback the Current Transaction?
  10. What Happens to the Current Transaction If a START TRANSACTION Is Executed?
  11. What Happens to the Current Transaction If a DDL Statement Is Executed?
  12. What Happens to the Current Transaction If the Session Is Ended?
  13. What Happens to the Current Transaction If the Session Is Killed?
  14. How Does MySQL Handle Read Consistency?
  15. What Are Transaction Isolation Levels?
  16. How To View and Change the Current Transaction Isolation Level?
  17. What Is a Data Lock?
  18. How To Experiment Data Locks?
  19. How Long a Transaction Will Wait for a Data Lock?
  20. What Happens to Your Transactions When ERROR 1205 Occurred?
  21. What Is a Dead Lock?
  22. How To Experiment Dead Locks?
  23. What Happens to Your Transactions When ERROR 1213 Occurred?
  24. What Are Impacts on Applications from Locks, Timeouts, and DeadLocks?

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