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IBM Assessment: 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 can be a subset of the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.
B) 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.
C) 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.
D) 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.

2. Which of the following is NOT true about schemas?

A) A schema enables the creation of multiple objects in a database without encountering namespace collisions
B) If a schema name is not specified, either by qualifying a database object name or by executing the SET CURRENT SCHEMA statement, the authorization ID of the current session user is used as the schema name by default
C) The value assigned to the CURRENT SCHEMA special register is persistent across database restarts
D) When most database objects are created, they are either implicitly or explicitly assigned to a schema

3. In which situation is shredding XML data recommended?

A) When the data is of low volume and requires a complex star-schema topology
B) When thenumber of nodes are volatile
C) When the data is naturally tabular
D) When the data by nature has sparse attributes

4. A transaction using the Read Stability isolation level scans the same table multiple times before it terminates. Which of the following can occur within this transaction's processing?

A) Rows removed by other transactions that appeared in one scan will no longer appear in subsequent scans.
B) Rows that have been updated can be changed by other transactions from one scan to the next.
C) Rows added by other transactions that did not appear in one scan can be seen in subsequent scans.
D) Uncommitted changes made by other transactions can be seen from one scan to the next.

5. When a client using the SERVER_ENCRYPT authentication type connects to a server using the SERVER authentication type, what happens?

A) Data passed between the client and the server is encrypted.
B) User IDs and passwords are passed to the server unencrypted.
C) An error will occur.
D) User IDs and passwords are encrypted before they are passed to the server.

Solutions: