Physical Database Design - General Questions

1.

A multidimensional database model is used most often in which of the following models?

A.	Data warehouse
B.	Relational
C.	Hierarchical
D.	Network

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

2.

Sequential retrieval on a primary key for sequential file storage has which of the following features?

A.	Very fast
B.	Moderately fast
C.	Slow
D.	Impractical

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

3.

A rule of thumb for choosing indexes for a relational database includes which of the following?

A.	Indexes are more useful on smaller tables.
B.	Indexes are more useful for columns that do not appear frequently in the WHERE clause in queries.
C.	Do not specify a unique index for the primary key of each table.
D.	Be careful indexing attributes that have null values.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

4.

The fastest read/write time and most efficient data storage of any disk array type is:

A.	RAID-0.
B.	RAID-1.
C.	RAID-2.
D.	RAID-3.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

5.

A secondary key is which of the following?

A.	Nonunique key
B.	Primary key
C.	Useful for denormalization decisions
D.	Determines the tablespace required

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

6.

What is the best data type definition for Oracle when a field is alphanumeric and has a fixed length?

A.	VARCHAR2
B.	CHAR
C.	LONG
D.	NUMBER

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

7.

Which of the following is not a factor to consider when switching from small to large block size?

A.	The length of all of the fields in a table row.
B.	The number of columns
C.	Block contention
D.	Random row access speed

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

8.

Which of the following are integrity controls that a DBMS may support?

A.	Assume a default value in a field unless a user enters a value for that field.
B.	Limit the set of permissible values that a field may assume.
C.	Limit the use of null values in some fields.
D.	All of the above.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

1
2