After data has been loaded into a database, the __?__ tests and fine-tunes the database for performance, integrity, concurrent access, and security constraints.

Database Administrator

Explanation:

The main duty of Database Administrator is to analyse database for any errors and consider

1. Performance:

The performance of database matters is checked to see if there is any delay in retrieving data from database so that users can have a smooth data retrievals.

2. Integrity:

It is checked to see if the data retrieval is not changing the state of the data which is the data before retrieval and after it remains the same.

3. Security:

The data administrator also checks if there is any anonymous entry in the database to cause problems.