Problem 1

With regard to the data processing cycle, explain the meaning of the phrase "garbage in, garbage out" clearly. How do you prevent this from happening?

Problem 2

1. The relational DBMS query language provides easy access to information about an organization's activities. Does this mean that online and real-time processing should be used for all transactions? Does the organization need real-time financial reports? Give your opinion.

2. Why do you think it is so important to have good data?

3. What is meant by a data dictionary, what is its content, and how is it used? And provide real examples of using the data dictionary!

Problem 3

Several years ago, news began circulating about a computer virus named Michelangelo that regulated access to "ignite". The virus attaches to the computer operating system sector. The virus will detach itself, destroying all computer data. Although the excitement surrounding viruses is largely an issue, the Michelangelo Virus helps the public who use computers to become aware of the vulnerability of their systems to outside attacks.

Requested:

1. What is a computer virus? Give at least three reasons why no system is completely safe from computer viruses.

2. Why is the virus a serious threat to information systems? What damage can a virus do to a computer system?

3. How does a virus resemble a Trojan horse?

4. What steps can be taken to prevent the spread of computer viruses?