Locks placed by command are implicit locks.

Database administration refers to a function that applies to the entire organization.

The transaction log contains a copy of every database record (or page) after it has changed. These records are called before images.

The lost update problem is when User A reads data that have been processed by a portion of a transaction from User B.

Two transactions that run concurrently and generate results that are consistent with the results that would have occurred if they had run separately are referred to as serializable transactions.