You are viewing an older version of this section. View current production version.
Join the SingleStore Community Today
Get expert advice, develop skills, and connect with others.


Commits any existing open transaction on the current connection and starts a new transaction.




  • This command must be run on the master aggregator or a child aggregator node (see Node Requirements for MemSQL Commands.
  • If the transaction is successful, execute the COMMIT command to commit the changes; if the transaction is unsuccessful or needs to be reverted, then execute the ROLLBACK command to revert the changes.


For this example, consider the following Employee table:

ID Name
30 Jim
20 Rob
40 Rick
UPDATE Employee SET Name = "John" WHERE ID = 300;
Query OK, 0 rows affected (0.00 sec)
Rows matched: 0  Changed: 0  Warnings: 0

Run the SELECT query to verify if the UPDATE is correct:

SELECT * FROM Employee;
| ID   | Name  |
|   30 | Jim   |
|   20 | Rob   |
|   40 | Rick  |

Run ROLLBACK since there were no matching results for the ID and the UPDATE was not successful.


Note: Before the user runs COMMIT or ROLLBACK, only that user can see the updates made after BEGIN was run.