Often clients with mission-critical applications need to track every update and change to a MySQL database system. This is useful not just for security but to also for replicating user actions when there's a complaint.

Being able to say "User X logged in and did these exact actions" from a DB review is often invaluable both in Q/A and in production and the time to resolve database-related user trouble tickets can be done in minutes when 100% of a user's actions can be replicated.