Question

This signals a successful end of the transaction so that any changes (updates) executed by the transaction can be safely committed to the database and will not be undone. What does this signal indicate?

1) The transaction has been completed successfully
2) The transaction has been cancelled
3) The transaction has encountered an error
4) The transaction is still in progress

Answer 1

The signal refers to a commit operation, indicating that the transaction has been completed successfully and the data changes can be committed to the database.

Step-by-step explanation:

The signal that indicates any changes (updates) executed by the transaction can be safely committed to the database and will not be undone corresponds to the first option: The transaction has been completed successfully. This signal is known as a commit operation in database management systems. When a transaction reaches its commit point, it means that all the data manipulations have been executed without any errors, and the changes can be made permanent. At this point, the database management system will write all the relevant data to the database. If a transaction encountered an error or needed to be cancelled for some reason, the system would initiate a rollback rather than a commit.