Question

This signals that the transaction has ended unsuccessfully, so that any changes or effects that the transaction may have applied to the database must be undone. True or False?

Answer 1

When a transaction is unsuccessful, it is necessary to undo any changes or effects it may have applied to the database using a rollback mechanism. This maintains data consistency in the database.

Step-by-step explanation:

The statement is true. When a transaction is unsuccessful, it is necessary to undo any changes or effects it may have applied to the database. This is typically done using a mechanism called a rollback, which reverts the database back to its state before the transaction began.

For example, suppose a transaction was supposed to transfer funds from one bank account to another. If the transaction fails for some reason (e.g., insufficient funds), the changes made to the account balances should be undone to maintain data consistency.

Rollbacks are an important feature of database management systems and ensure that the database remains in a consistent and reliable state.