The statements listed in this section (and any synonyms for them)
implicitly end any transaction active in the current session, as
if you had done a
executing the statement. As of MySQL 5.5.3, most of these
statements also cause an implicit commit after executing; for
additional details, see the end of this section.
Data definition language (DDL)
statements that define or modify database objects.
ALTER DATABASE ... UPGRADE DATA DIRECTORY
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
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
TABLE and then roll back the transaction, the table
remains in existence.
CREATE TABLE ...
SELECT causes an implicit commit before and after
the statement is executed when you are creating nontemporary
tables. (No commit occurs for
CREATE TEMPORARY TABLE
... SELECT.) This is to prevent an issue during
replication where the table could be created on the master
after a rollback, but fail to be recorded in the binary log,
and therefore not replicated to the slave. For more
information, see Bug #22865.
TABLES commits a transaction only if any tables
currently have been locked with
TABLES to acquire nontransactional table locks. A
commit does not occur for
FLUSH TABLES WITH READ
LOCK because the latter statement does not acquire
Transactions cannot be nested. This is a consequence of the
implicit commit performed for any current transaction when you
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
statement differs from the use of the
keyword that starts a
END compound statement. The latter does not cause an
implicit commit. See Section 13.6.1, “
BEGIN ... END
As of MySQL 5.5.3, most statements that previously caused an implicit commit before executing also do so after executing. The intent is to handle each such statement in its own special transaction because it cannot be rolled back anyway. The following list provides additional details pertaining to this change:
CREATE TABLE variants
CREATE TABLE for
InnoDB tables and
CREATE TABLE ...
SELECT) that previously were special cases no longer
are so because
uniformly causes an implicit commit before and after
Transaction-control and locking statements behave as before.