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A transaction manager is which of the following?

A. Maintains a log of transactions

B. Maintains before and after database images

C. Maintains appropriate concurrency control

D. All of the above

Answer: Option D


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An autonomous homogenous environment is which of the following?

A. The same DBMS is at each node and each DBMS works independently.

B. The same DBMS is at each node and a central DBMS coordinates database access.

C. A different DBMS is at each node and each DBMS works independently.

D. A different DBMS is at each node and a central DBMS coordinates database access.