What is the primary function of a database transaction?

The primary function of a database transaction is to perform sequences of operations as a single logical unit of work. This ensures that all operations within the transaction are completed successfully and maintain the integrity of the database. If any part of the transaction fails, the entire set of operations can be rolled back, leaving the database in a consistent state. This concept is vital for maintaining data integrity, especially in scenarios involving multiple related operations, such as withdrawing money from one account and depositing it into another. Only when all parts of the transaction are successfully executed will the changes be committed to the database.

The other choices focus on aspects that do not accurately capture the essence of a transaction. Creating databases pertains to database design, modifying the database structure relates to schema changes rather than transactions, and visualizing data relationships involves data representation rather than the execution of operations. Thus, they do not highlight the critical role of a transaction in managing a sequence of operations consistently and reliably.