Database transactions Database transaction concepts and handling. Understanding database transactionsThis is an introduction to database transactions.BEGIN WORKStarts a database transaction in the current connection.SAVEPOINTDefines or resets the position of a rollback point in the current transaction.COMMIT WORKValidates and terminates a database transaction in the current connection.ROLLBACK WORKCancels and terminates a database transaction in the current connection.RELEASE SAVEPOINTDestroys the specified savepoint in the current transaction.SET ISOLATIONDefines the transaction isolation level for the current connection.SET LOCK MODEDefines the behavior of the program that tries to access a locked row or table.