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
This Question Belongs to Database >> Physical Database Design
A. All fields are stored in one relation.
B. All fields are stored in two relations.
C. All fields are stored in three relations.
D. All fields are stored in four relations.
Selecting a data type involves which of the following?
A. Maximize storage space
B. Represent most values
C. Improve data integrity
D. All of the above.
A. VARCHAR2
B. CHAR
C. LONG
D. NUMBER
A. All fields are stored in one relation.
B. All fields are stored in two relations.
C. All fields are stored in three relations.
D. All fields are stored in four relations.
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