This statement starts a new transaction inside of TiDB. It is similar to the statements
START TRANSACTION and
In the absense of a
BEGIN statement, every statement will by default autocommit in its own transaction. This behavior ensures MySQL compatibility.
mysql> CREATE TABLE t1 (a int NOT NULL PRIMARY KEY); Query OK, 0 rows affected (0.12 sec) mysql> BEGIN; Query OK, 0 rows affected (0.00 sec) mysql> INSERT INTO t1 VALUES (1); Query OK, 1 row affected (0.00 sec) mysql> COMMIT; Query OK, 0 rows affected (0.01 sec)
This statement is understood to be fully compatible with MySQL. Any compatibility differences should be reported via an issue on GitHub.