Role-Based Access Control (RBAC) is a method of access control that restricts access to resources based on the roles of individual users within an organization. It ensures that only authorized users are able to access certain resources based on their assigned roles, minimizing the risk of unauthorized access. RBAC is widely used in database security to enforce strict access control policies.

In ETL process testing, dealing with massive data volumes is a prevalent challenge, requiring efficient testing strategies to ensure scalability, performance, and accuracy of data processing.

Indexing plays a crucial role in enhancing the performance of data retrieval operations by enabling the database system to locate and access the required data more efficiently. It organizes the data in a structured format, reducing the time taken to search through large datasets. Thus, indexing contributes to better performance in terms of query execution speed and response time.

Key rotation is a crucial key management technique for ensuring the security of encrypted data in a database. It involves periodically changing encryption keys used to encrypt data, which helps mitigate the risk associated with compromised or outdated keys. By regularly rotating keys, organizations can enhance security and reduce the window of vulnerability to potential attacks. Proper key rotation strategies should balance security requirements with operational efficiency to ensure smooth functioning of the database system. Therefore, option 1 is the correct choice.

Relationship

A SQL subquery is a query nested within another query, typically enclosed within parentheses. Subqueries allow for more complex queries by enabling the use of the results of one query in another, facilitating data retrieval and manipulation.

Query optimization in a database system aims to reduce query execution latency and improve overall system performance. Latency refers to the time delay between the initiation of a query and the return of results. By optimizing queries to minimize latency, database systems can operate more efficiently, providing faster response times to users.

In ETL processes, data transformation ensures that data conforms to predefined business rules, which is a critical aspect of data validation. Transformation validation verifies that the data has been transformed correctly according to the specified business rules and requirements.

Checking for long-running queries is crucial to identify any inefficient queries causing high CPU utilization and address them accordingly.

Running Test Cases Against Database State: Database testing tools like SQLUnit allow testers to run test cases against the current state of the database. By doing so, they can verify the consistency of data throughout the testing process, ensuring that data remains intact and consistent.