Data definition language (DDL) statements that define or modify database objects. ALTER TABLE, CREATE INDEX, DROP INDEX, DROP TABLE, RENAME TABLE.

ALTER TABLE, CREATE TABLE, and DROP TABLE do not commit a transaction if the TEMPORARY keyword is used. (This does not apply to other operations on temporary tables such as CREATE INDEX, which do cause a commit.) However, although no implicit commit occurs, neither can the statement be rolled back. Therefore, use of such statements will violate transaction atomicity: For example, if you use CREATE TEMPORARY TABLE and then roll back the transaction, the table remains in existence.

The CREATE TABLE statement in InnoDB is processed as a single transaction. This means that a ROLLBACK from the user does not undo CREATE TABLE statements the user made during that transaction.

Beginning with MySQL 5.0.8, CREATE TABLE, CREATE DATABASE DROP DATABASE, and TRUNCATE TABLE cause an implicit commit.

Beginning with MySQL 5.0.13, ALTER FUNCTION, ALTER PROCEDURE, CREATE FUNCTION, CREATE PROCEDURE, DROP FUNCTION (for stored functions, not UDFs), and DROP PROCEDURE cause an implicit commit.

Beginning with MySQL 5.0.15, ALTER VIEW, CREATE TRIGGER, CREATE VIEW, DROP TRIGGER, and DROP VIEW cause an implicit commit.

Statements that implicitly use or modify tables in the mysql database. Beginning with MySQL 5.0.15, CREATE USER, DROP USER, and RENAME USER cause an implicit commit.

Transaction-control and locking statements. BEGIN, LOCK TABLES, SET AUTOCOMMIT=1 (if the value is not already 1), START TRANSACTION, UNLOCK TABLES.

UNLOCK TABLES commits a transaction only if any tables currently have been locked with LOCK TABLES. This does not occur for UNLOCK TABLES following FLUSH TABLES WITH READ LOCK because the latter statement does not acquire table-level locks.

Transactions cannot be nested. This is a consequence of the implicit commit performed for any current transaction when you issue a START TRANSACTION statement or one of its synonyms.

Statements that cause an implicit commit cannot be used in an XA transaction while the transaction is in an ACTIVE state.

The BEGIN statement differs from the use of the BEGIN keyword that starts a BEGIN ... END compound statement. The latter does not cause an implicit commit. See Section 12.8.1, “BEGIN ... END Compound Statement Syntax”.

Data loading statements. LOAD MASTER DATA, LOAD DATA INFILE. Before MySQL 5.0.26, LOAD DATA INFILE caused an implicit commit for all storage engines. As of MySQL 5.0.26, it causes an implicit commit only for tables using the NDB storage engine. For more information, see Bug#11151.