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IBM Assessment: DB2 9 Family Fundamentals Sample Questions:

1. Which of the following best describes the lock protection provided by DB2 for the current row of a cursor?

A) The row is protected from updates and deletes by the current application and from positioned updates and deletes that reference another cursor of the same application.
B) The cursor is protected from positioned updates and deletes that reference another cursor of a different application.
C) The cursor is only protected from updates and deletes by concurrent applications.
D) The row is only protected from positioned updates and deletes that reference another cursor of the same application.

2. Given the following two tables:
TAB1 R1
A A A B B C C D E TAB2 R2
A A B B C C D Which of the following queries returns the following result set?
RETVAL
E

A) SELECT r1 ASretval FROM tab1 EXCEPT SELECT r2 AS retval FROM tab2
B) SELECT DISTINCT r1 ASretval FROM tab1, tab2 WHERE r1 <> r2
C) SELECT r1 ASretval FROM tab1 UNION SELECT r2 AS retval FROM tab2
D) SELECT r1 ASretval FROM tab1 INTERSECT SELECT r2 AS retval FROM tab2

3. Application A currently holds an exclusive lock on a single row and application B tries to access that row. If lock timeout is set to -1 and both applications are using isolation level RS, which of the following will occur?

A) Application B will be placed in a lock-wait state until applicationA releases its lock.
B) Applications A and B will cause a deadlock situation.
C) Application B will read the row and see uncommitted changes made by application A.
D) Application B will read the previous version of the row.

4. Given the following two tables:
TAB1 C1 C2
1 Antarctica 2 Africa 3 Asia 4 Australia TAB2 CX CY
5 Europe 6 North America 7 South America
Which of the following SQL statements will insert all rows found in table TAB2 into table TAB1?

A) INSERT INTO tab1 VALUES (tab2.cx, tab2.cy)
B) INSERT INTO tab1 VALUES (SELECTcx, cy FROM tab2)
C) INSERT INTO tab1 SELECTcx, cy FROM tab2
D) INSERT INTO tab1 (c1, c2) VALUES (SELECTcx, cy FROM tab2)

5. If the following SQL statements are executed:
CREATE TABLE tab1 (id SMALLINT NOT NULL PRIMARY KEY,
name VARCHAR(25));
CREATE TABLE tab2 (empid SMALLINT,
weekno SMALLINT,
payamt DECIMAL(6,2),
CONSTRAINT const1 FOREIGN KEY (empid)
REFERENCES taba(id) ON UPDATE NO ACTION);
Which of the following statements is true?

A) Only values that exist in the ID column of table TAB1 are allowed to be inserted in the EMPID column of table TAB2
B) Only values that do not already exist in the ID column of table TAB1 are allowed to be inserted in the EMPID column of table TAB2
C) The updating of values in the ID column of table TAB1 is not allowed
D) When values that exist in the ID column of table TAB1 are updated, corresponding values in the EMPID column of table TAB2 are updated as well

Solutions: