11. Data replication is favored where most process requests are read-only and where the data are relatively static.

A. True
B. False

12. The cost to perform a snapshot refresh may depend on whether the snapshot is simple or complex.

A. True
B. False

13. The semijoin approach saves network traffic.

A. True
B. False

14. In a semijoin, only the joining attribute is sent from one site to another, and then only the required rows are returned.

A. True
B. False

15. The problem of concurrency control is more complex in a distributed database.

A. True
B. False