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MySQL Tutorial - Turn on and off Autocommit

By: FYIcenter.com

(Continued from previous topic...)

How To Switch between Autocommit-On and Autocommit-Off Modes?

By default, your connection session will be in Autocommit-On mode, where every server executable statement will start a new transaction, and end the transaction when the execution ends. Changes will be committed. So consider this mode as single-statement autocommitted transaction mode.

If you don't like the default Autocommitt-On mode, you can use the "SET AUTOCOMMIT = 0" to switch to the Autocommitt-Off mode. Of course, you can switch back the Autocommitt-On mode with the "SET AUTOCOMMIT = 0" command. The following tutorial exercise shows some good examples:

>\mysql\bin\mysql -u dev -piyf fyi

mysql> -- You are in the default Autocommit-On mode now

mysql> SET AUTOCOMMIT = 0;
Query OK, 0 rows affected (0.03 sec)

mysql> -- You are in the Autocommit-Off mode now

mysql> SET AUTOCOMMIT = 0;
Query OK, 0 rows affected (0.03 sec)

mysql> -- You are back in the Autocommit-On mode now

(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?