General Questions

Question 11 :

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

Question 12 :

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

Question 13 :

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

Question 14 :

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

Question 15 :

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