"Database & File"

#1. What is meant by data independence? Explain your answer.
#2. Identify two benefits of separating application software from the database management system.
#3. Identify the level within a database system (user, programmer of application software, and designer of the
DBMS software) at which each of the following concerns or activities occur:
a. How should data be stored on a disk to maximize efficiency?
b. Is there a vacancy on flight 243?
c. Could a relation be stored as a sequential file?
d. How many times should a user be allowed to mistype a password before the conversation is terminated?
e. How can the PROJECT operation be implemented?
#4. Design a relational database containing information about music composers, their lives, and their
compositions. (Avoid redundancies similar to those in Figure 9.4)

Part 2:

#1. Suppose a sequential file contains 50,000 records, and 5 milliseconds are required to interrogate an entry.
How long should we expect to wait when retrieving a record from the middle of the file?
#2. Explain one advantage that
a. a sequential file has over an indexed file
b. a sequential file has over a hash file
c. an indexed file has over a sequential file
d. an indexed file has over a hash file
e. a hash file has over a sequential file
f. a hash file has over an indexed file
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