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IBM DB2 9 Family Fundamentals Sample Questions:

1. When defining a referential constraint between the parent table T2 and the dependent table T1, which of the following is true?

A) The list of column names in the FOREIGN KEY clause must be identical to the list of column names in the primary key of T1 or a UNIQUE constraint that exists on T1.
B) The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.
C) The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T1 or a UNIQUE constraint that exists on T1.
D) The list of column names in the FOREIGN KEY clause must be identical to the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.

2. To which of the following resources can a lock NOT be applied?

A) Buffer pools
B) Table spaces
C) Rows
D) Tables

3. Which of the following is NOT a characteristic of a unique index?

A) A unique index cannot be created for a populated table if the key column specified contains more than one NULL value
B) In order for an index to be used to support a unique constraint, it must have been defined with the UNIQUE attribute
C) A unique index can only be created for a non-nullable column
D) Each column in a base table can only participate in one uniqueindex, regardless of how the columns are grouped (the same column cannot be used in multiple unique indexes)

4. A table contains a list of all seats available at a football stadium. A seat consists of a section number, a seat number, and whether or not the seat has been assigned. A ticket agent working at the box office generates a list of all unassigned seats. When the agent refreshes the list, it should only change if another agent assigns one or more unassigned seats. Which of the following is the best isolation level to use for this application?

A) Repeatable Read
B) Uncommitted Read
C) Read Stability
D) Cursor Stability

5. How does DB2 protect the integrity of indexes when data is updated?

A) Locks are acquired on index keys.
B) Locks are acquired on index pointers.
C) Locks are acquired on the data.
D) Locks are acquired on index pages.

Solutions: