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IBM Assessment: DB2 9 Family Fundamentals Sample Questions:

1. A sequence was created with the DDL statement shown below:
CREATE SEQUENCE my_seq START WITH 10 INCREMENT BY 10 CACHE 10
User USER1 successfully executes the following statements in the order shown:
VALUES NEXT VALUE FOR my_seq INTO :hvar; VALUES NEXT VALUE FOR my_seq INTO :hvar;
User USER2 successfully executes the following statements in the order shown:
ALTER SEQUENCE my_seq RESTART WITH 5 INCREMENT BY 5 CACHE 5; VALUES NEXT VALUE FOR my_seq INTO :hvar;
After users USER1 and USER2 are finished, user USER3 executes the following query:
SELECT NEXT VALUE FOR my_seq FROM sysibm.sysdummy1
What value will be returned by the query?

A) 20
B) 30
C) 10
D) 5

2. Given the following function:
CREATE FUNCTION emplist () RETURNS TABLE ( id CHAR(6) , firstname VARCHAR(12) , lastname VARCHAR(15) ) LANGUAGE SQL BEGIN ATOMIC RETURN SELECT EMPNO, FIRSTNME, LASTNAME FROM EMPLOYEE WHERE WORKDEPT IN ('A00', 'B00'); END
How can this function be used in an SQL statement?

A) SELECT id,firstname, lastname FROM TABLE(EMPLIST()) AS t
B) SELECTTABLE(EMPLIST()) FROM EMPLOYEE
C) SELECTEMPLIST(id, firstname, lastname) FROM EMPLOYEE
D) SELECTTABLE(EMPLIST()) AS t FROM EMPLOYEE

3. Which of the following is TRUE for the DB2 isolation level Cursor Stability (CS)?

A) An application process acquires at least a share lock on the current row of every cursor.
B) Any row that is read during a unit of work cannot be changed by other application processes until the unit of work is complete.
C) Any row changed by another application process can be read, even if the change has not been committed by that application process.
D) An application process that issues the same query more than once in a unit of work will not see additional rows caused by other application processes appending new information to the database.

4. Given the following tables:
TABLEA
EMPIDNAME
1 USER1 2 USER2
TABLEB
EMPID WEEKNO PAYAMT
1 1 1000.00
1 2 1000.00
2 1 2000.00
and the fact that TABLEB was defined as follows:
CREATE TABLE tableb (empid SMALLINT,
weekno SMALLINT,
payamt DECIMAL(6,2),
CONSTRAINT const1 FOREIGN KEY (empid)
REFERENCES tablea(empid)
ON DELETE NO ACTION)
If the following command is issued:
DELETE FROM tablea WHERE empid=2
How many rows will be deleted from TABLEA and TABLEB?

A) TABLEA - 0, TABLEB - 1
B) TABLEA - 0, TABLEB - 0
C) TABLEA - 1, TABLEB - 0
D) TABLEA - 1, TABLEB - 1

5. Which of the following isolation levels will lock all rows scanned to build a result data set?

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

Solutions: