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START TRANSACTION

This statement starts a new transaction inside of TiDB. It is similar to the statements BEGIN and SET autocommit=0.

In the absence of a START TRANSACTION statement, every statement will by default autocommit in its own transaction. This behavior ensures MySQL compatibility.

Synopsis

BeginTransactionStmt:

BeginTransactionStmt

Examples

mysql> CREATE TABLE t1 (a int NOT NULL PRIMARY KEY);
Query OK, 0 rows affected (0.12 sec)

mysql> START TRANSACTION;
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)

MySQL compatibility

This statement is understood to be partly compatible with MySQL.

  • START TRANSACTION immediately starts a transaction inside TiDB. This differs from MySQL, where START TRANSACTION lazily creates a transaction unless the modifier START TRANSACTION WITH CONSISTENT SNAPSHOT is used.
  • READ ONLY and its extended options are only syntactically compatible, and its effect is equivalent to START TRANSACTION.

Any compatibility differences should be reported via an issue on GitHub.

See also