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What Happens to Your Transactions When ERROR 1213 Occurred
What Happens to Your Transactions When ERROR 1213 Occurred? - MySQL FAQs - Transaction Management: Commit or Rollback If your transaction receives the "Deadlock found when trying to get lock" - ERROR 1213, MySQL server automatically terminates your transaction and rolls back your data changes of the... 2007-05-11, 7468👍, 0💬

How To Test Transaction Isolation Levels
How To Test Transaction Isolation Levels? - MySQL FAQs - Transaction Management: Commit or Rollback If you want to test transaction isolation levels, you need to make sure that: The tables are created with transaction-safe storage engines, like InnoDB. Multiple-statement transactions are started wit... 2007-05-09, 7029👍, 0💬

What Happens to the Current Transaction If a DDL Statement Is Executed
What Happens to the Current Transaction If a DDL Statement Is Executed? - MySQL FAQs - Transaction Management: Commit or Rollback If a DDL statement is executed, the current transaction will be committed and ended. All the database changes made in the current transaction will become permanent. This ... 2007-05-11, 6288👍, 0💬

What Happens to Your Transactions When ERROR 1205 Occurred
What Happens to Your Transactions When ERROR 1205 Occurred? - MySQL FAQs - Transaction Management: Commit or Rollback If your transaction receives the "Lock wait timeout exceeded" - ERROR 1205, MySQL server automatically terminates your transaction and rolls back your data changes of the entire tran... 2007-05-11, 6204👍, 0💬

How Does MySQL Handle Read Consistency
How Does MySQL Handle Read Consistency? - MySQL FAQs - Transaction Management: Commit or Rollback Read consistency is a concept that describes how consistent the output will be on two subsequent read operations. A read operation is usually a stand alone SELECT statement or a SELECT subquery in a par... 2007-05-11, 5798👍, 0💬

How Long a Transaction Will Wait for a Data Lock
How Long a Transaction Will Wait for a Data Lock? - MySQL FAQs - Transaction Management: Commit or Rollback If you issue a UPDATE or DELETE statement on a row that has an exclusive lock owned by another session, your statement will be blocked to wait for the other session to release the lock. But th... 2007-05-11, 5753👍, 0💬

How To End the Current Transaction
How To End the Current Transaction? - MySQL FAQs - Transaction Management: Commit or Rollback There are several ways the current transaction can be ended implicitly or explicitly: In "Autocommit On" mode, a single-statement transaction will be ended implicitly when the execution of the statement end... 2007-05-11, 5739👍, 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, 5726👍, 0💬

What Is a Dead Lock
What Is a Dead Lock? - MySQL FAQs - Transaction Management: Commit or Rollback A dead lock is phenomenon happens between two transactions with each of them holding a lock that blocks the other transaction as shown in the following diagram: (transaction 1) (transaction 2) update row X to create lock ... 2007-05-09, 5634👍, 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, 5625👍, 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, 5585👍, 0💬

How To Experiment Data Locks
How To Experiment Data Locks? - MySQL FAQs - Transaction Management: Commit or Rollback If you want to have some experience with data locks, you can create two windows running two mysql transactions in two sessions. In session 1, you can run a UPDATE statement with REPEATABLE READ transaction isolat... 2007-05-11, 5584👍, 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, 5570👍, 0💬

How To View and Change the Current Transaction Isolation Level
How To View and Change the Current Transaction Isolation Level? - MySQL FAQs - Transaction Management: Commit or Rollback If you want to view or change the current transaction isolation level, you can use the following commands: SELECT @@TX_ISOLATION FROM DUAL; -- Viewing the current transaction iso... 2007-05-11, 5540👍, 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, 5533👍, 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, 5461👍, 0💬

What Happens to the Current Transaction If the Session Is Killed
What Happens to the Current Transaction If the Session Is Killed? - MySQL FAQs - Transaction Management: Commit or Rollback If a session is killed by the DBA, the current transaction in that session will be rolled back and ended. All the database changes made in the current transaction will be remov... 2007-05-11, 5434👍, 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, 5414👍, 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, 5347👍, 0💬

How To Experiment Dead Locks
How To Experiment Dead Locks? - MySQL FAQs - Transaction Management: Commit or Rollback If you want to have some experience with dead locks, you can create two windows running two mysql transactions in two sessions at the REPEATABLE READ transaction isolation level. Then run some UPDATE statements a... 2007-05-09, 5278👍, 0💬

What Are Transaction Isolation Levels
What Are Transaction Isolation Levels? - MySQL FAQs - Transaction Management: Commit or Rollback There are 4 transaction isolation levels defined by SQL-1992 standard: READ UNCOMMITTED - The SELECT statements in one transaction will read uncommitted data changes from transactions of all connected se... 2007-05-09, 5261👍, 0💬

What Are the Impacts on Applications from Locks, Timeouts, and DeadLocks
What Are the Impacts on Applications from Locks, Timeouts, and DeadLocks? - MySQL FAQs - Transaction Management: Commit or Rollback 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 d... 2007-05-08, 5252👍, 0💬

What Is a Data Lock
What Is a Data Lock? - MySQL FAQs - Transaction Management: Commit or Rollback 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) - ... 2007-05-09, 5161👍, 0💬

What Is a Transaction
What Is a Transaction? - MySQL FAQs - Transaction Management: Commit or Rollback A transaction is a logical unit of work requested by a user to be applied to the database objects. MySQL server introduces the transaction concept to allow users to group one or more SQL statements into a single transac... 2007-05-11, 5035👍, 0💬

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.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML