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Implicit Transactions in MatrixOne

In MatrixOne's Implicit transactions also obey the following rules:

Implicit transaction rules

  • When AUTOCOMMIT changes, if the implicit transaction is not committed, mo will report an error and prompt the user to submit the change.
  • AUTOCOMMIT=0, and when there are no active transactions, DDL (Data Definition Language) and parameter configuration files can be executed, but behaviors other than CREATE cannot be rolled back.
  • In the case of AUTOCOMMIT=1, each DML (Data Manipulation Language, Data Manipulation Language) statement is a separate transaction and is committed immediately after execution.
  • In the case of AUTOCOMMIT=0, each DML statement will not be submitted immediately after execution, and COMMIT or ROLLBACK needs to be performed manually. If the client exits without committing or rolling back, then Rollback by default.
  • In the case of AUTOCOMMIT=0, DML and DDL can exist at the same time, but DDL is only limited to CREATE; all others cannot be supported.
  • When there is uncommitted content in the implicit transaction, opening an explicit transaction will force the submission of the previously uncommitted content.


For example, after the Explicit Transactions ends, continue to insert data (4,5,6) to t1, which becomes an implicit transaction. Whether the implicit transaction is committed immediately depends on the value of the AUTOCOMMIT parameter:

CREATE TABLE t1(a bigint, b varchar(10), c varchar(10));
INSERT INTO t1 values(1,2,3);

-- Check the AUTOCOMMIT parameters
| Variable_name | Value |
| autocommit    | 1     |
1 row in set (0.00 sec)
-- Here an implicit transaction begins, with each DML committed immediately after execution with AUTOCOMMIT=.1
insert into t1 values(4,5,6);

-- Implicit transaction is committed automatically, and the table structure is shown below
mysql> select * from t1;
| a    | b    | c    |
|    1 | 2    | 3    |
|    4 | 5    | 6    |
2 rows in set (0.00 sec)