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MySQL Tutorial - What Is a Data Lock

By: FYIcenter.com

(Continued from previous topic...)

What Is a Data Lock?

MySQL uses two types of data locks at two levels to provide you the transaction isolation level you need:

  • Share Lock at Row Level (S) - A data row is locked by a transaction for reading.
  • Exclusive Lock at Row Level (X) - A data row is locked by a transaction for updating and deleting.
  • Intention Share Lock at Table Level (IS): A data table is locked by a transaction for placing share locks at row level.
  • Intention Exclusive Lock at Table Level (IX): A data table is locked by a transaction for placing exclusive lock at row level.

(Continued on next topic...)

  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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