A ____ trace indicates the sequence of messages that produced an exception.

Wireless network devices use ________ to communicate with each other

A) satellites B) radio waves C) fiber optics D) DSL

Which of the following is true about indexes and index fragmentation?

A. indexes do not have to be updated once they are created B. records should be stored on the disk contiguously C. database records stored in order are said to be fragmented D. external fragmentation occurs due to accumulation of free space between records