Physical Database Design

Q1: 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.

Q2: 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

Q3: If a denormalization situation exists with a one-to-one binary relationship, which of the following is true?

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.

Q4: If a denormalization situation exists with a many-to-many or associative binary relationship, which of the following is true?

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.

Q5: What is the best data type definition for Oracle when a field is alphanumeric and has a length that can vary?

A VARCHAR2

B CHAR

C LONG

D NUMBER

Q6: The blocking factor is:

A a group of fields stored in adjacent memory.

B the number of physical records per page.

C attributes grouped together by the same primary key.

D attributes grouped together by the same secondary key.

Q7: 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.

Q8: Which of the following improves a query's processing time?

A Write complex queries.

B Combine a table with itself.

C Query one query within another.

D Use compatible data types.

Q9: 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.

Q10: 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

Q11: 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

Q12: A multidimensional database model is used most often in which of the following models?

A Data warehouse

B Relational

C Hierarchical

D Network

Q13: Which of the following is an advantage of partitioning?

A Complexity

B Inconsistent access speed

C Extra space

D Security

Q14: A secondary key is which of the following?

A Nonunique key

B Primary key

C Useful for denormalization decisions

D Determines the tablespace required

Q15: 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.


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