Answer the following questions 1, 3, 5, 7, 9, 11, 13, 15 and 16 1. Describe the
ID: 3564419 • Letter: A
Question
Answer the following questions 1, 3, 5, 7, 9, 11, 13, 15 and 16
1. Describe the following disk concepts or components.
a.Platter and the recording surface.
b.Track.
c.Cylinder.
d.Read/Write head.
e.Acess-arm mechanism.
3. Describe the four steps in the transfer of data from disk to primary memory
5. What is an index? Compare the concept of the index in a book to an index in an information system.
7. What is an indexed-sequential file?
9.Describe how a direct search works using a B+-tree index
11.Answer the following general questions about indexes:
a. Can an index be built over a non-unique field?
b. Can an index be built over a field if the file is not stored in sequence by that field?
c. Can an index be built over a combination of fields as well as over a single field?
d. Is there a limit to the number of indexes that can be built for a file?
e. How is an index affected when a change is made to a file? Does every change to a file affect every one of its indexes?
f. Can an index be used to achieve sequential access? Explain.
13. Describe how a direct search works in a hashed file using the division-remainder method of hashing?
15. What is physical database design?
16.Describe why physical database design is necessary.
Explanation / Answer
1.
a)PLATTER AND THE RECORDING SURFACE: