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

Q

How To Switch between Autocommit-On and Autocommit-Off Modes? - MySQL FAQs - Transaction Management: Commit or Rollback

✍: FYIcenter.com

A

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

2007-05-11, 5582👍, 0💬

How To Create a Table for Transaction Testing
How To Create a Table for Transaction Testing? - MySQL FAQs - Transaction Management: Commit or Rollback If you want to learn transaction management, you should create a table with the InnoDB storage engine. The default storage engine MyISAM does not support the transaction concept. The tutorial exe... 2007-05-11, 5795👍, 0💬

How To Rollback the Current Transaction
How To Rollback the Current Transaction? - MySQL FAQs - Transaction Management: Commit or Rollback If you have used some DML statements updated some data objects, you find a problem with those updates, and you don't want those updates to be permanently recorded in the database, you can use the ROLLB... 2007-05-11, 5670👍, 0💬

How To Start a New Transaction
How To Start a New Transaction? - MySQL FAQs - Transaction Management: Commit or Rollback MySQL server offers two modes to manage transactions: Autocommit On - Default mode. Can be started with "SET AUTOCOMMIT = 1" command. In this mode, every single SQL statement is a new transaction. All changes w... 2007-05-11, 5631👍, 0💬

What Happens to the Current Transaction If a START TRANSACTION Is Executed
What Happens to the Current Transaction If a START TRANSACTION Is Executed? - MySQL FAQs - Transaction Management: Commit or Rollback If you are in a middle of a current transaction, and a START TRANSACTION command is executed, the current transaction will be committed and ended. All the database ch... 2007-05-11, 5626👍, 0💬

How To Switch between Autocommit-On and Autocommit-Off Modes
How To Switch between Autocommit-On and Autocommit-Off Modes? - MySQL FAQs - Transaction Management: Commit or Rollback 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 ... 2007-05-11, 5583👍, 0💬

How To Start a New Transaction Explicitly
How To Start a New Transaction Explicitly? - MySQL FAQs - Transaction Management: Commit or Rollback If you are confused on the implicit new transaction rules, you can always start a new transaction with the "START TRANSACTION" command to start a new transaction explicitly. "START TRANSACTION" comma... 2007-05-11, 5523👍, 0💬

How To Find Out the Current Transaction Mode
How To Find Out the Current Transaction Mode? - MySQL FAQs - Transaction Management: Commit or Rollback If you are not sure about your current transaction mode, you can use the "SELECT @@AUTOCOMMIT FROM DUAL" statement to find out as shown in the following tutorial exercise: >\mysql\bin\mysql -u dev... 2007-05-11, 5453👍, 0💬

How To Use UNION to Merge Outputs from Two Queries Together
How To Use UNION to Merge Outputs from Two Queries Together? - MySQL FAQs - SQL SELECT Statements with JOIN and Subqueries If you have two queries that returns the same row fields, you can merge their outputs together with the UNION operator. The following tutorial exercise shows you how to return a... 2007-05-11, 5444👍, 0💬

How To Commit the Current Transaction
How To Commit the Current Transaction? - MySQL FAQs - Transaction Management: Commit or Rollback If you have used some DML statements updated some data objects, and you want to have the updates to be permanently recorded in the database, you can use the COMMIT command. It will make all the database ... 2007-05-11, 5395👍, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.