How Effects of a Transaction Are Controlled
The COMMIT and ROLLBACK statements allow control of the effects of a transaction on the database as follows:
• The COMMIT statement makes the changes permanent.
• The ROLLBACK statement undoes the changes made by the transaction.
When a COMMIT statement is issued:
• The DBMS makes all changes resulting from the transaction permanent and terminates the transaction.
• When a ROLLBACK statement is issued, the DBMS undoes any database changes made by the transaction and terminates the transaction.