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Commits any existing open transaction on the current connection and starts a new transaction.
START TRANSACTION | BEGIN [WORK]
- 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
UPDATE Employee SET Name = "John" WHERE ID = 300; **** Query OK, 0 rows affected (0.00 sec) Rows matched: 0 Changed: 0 Warnings: 0
SELECT query to verify if the
UPDATE is correct:
SELECT * FROM Employee; **** +------+-------+ | ID | Name | +------+-------+ | 30 | Jim | | 20 | Rob | | 40 | Rick | +------+-------+
ROLLBACK since there were no matching results for the
ID and the
UPDATE was not successful.
Note: Before the user runs
ROLLBACK, only that user can see the updates made after
BEGIN was run.