Which of the following is NOT considered a database security control?

The reasoning behind identifying online transaction processing (OLTP) as not being considered a database security control lies in the function and purpose of OLTP systems. OLTP systems are designed primarily to manage and facilitate transactional data within a database environment, focusing on the speed and efficiency of data processing. They allow users to execute transactions such as inserting, updating, and deleting data efficiently, but they do not inherently provide security mechanisms.

In contrast, the other elements listed—as username, lock controls, and metadata controls—are integral to database security. A username is a critical authentication factor in verifying user identity and ensuring that only authorized individuals can access sensitive data. Lock controls involve mechanisms such as row-level locking or table locking to prevent unauthorized access or modifications during transactions. Metadata controls refer to managing the data about data, which typically includes access rights and data governance, aiding in enforcing security policies.

Together, these elements serve to safeguard data integrity, confidentiality, and availability, which are essential components of database security. In summary, while OLTP is vital for data handling and processing, it does not function as a dedicated security control within a database system.