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IBM Assessment: DB2 9.7 SQL Procedure Developer Sample Questions:

1. Using Optimistic Locking, both Transaction 1 and Transaction 2 have read the same row including the RID_BIT and ROW CHANGE TOKEN values. Transaction 1 updates the row after ensuring that the row has not changed after the previous SELECT by adding a RID_BIT and ROW CHANGE TOKEN predicate to the UPDATE statement. Transaction 2 now tries to update that same row using the same predicate as transaction 1. What will be the result?

A) The row will be found with the same ROW CHANGE TOKEN. Transaction 2 will now insert its values replacing those of transaction 1.
B) The row will be found with a different ROW CHANGE TOKEN and Transaction 2 will overwrite the values set in transaction 1.
C) The row will not be found because the value of the ROW CHANGE TOKEN has changed in regard to the UPDATE of transaction 1. Transaction 2 has to retry in order to retrieve the current data.
D) The row will not be found because the value of the ROW CHANGE TOKEN has changed in regard to the UPDATE of transaction 1. Transaction 2 will complete with an insert of a new row.

2. Click the Exhibit button.

Which statement is true about the CASE statement shown in the exhibit?

A) All employees will receive at least a 5% salary increase.
B) An employee with a rating of 1 receives a 10% salary increase.
C) An employee with a rating of 3 receives no salary increase.
D) An employee with a rating of 2 receives a 3% salary increase.

3. Which two statements are true about SQL procedures? (Choose 2)

A) SQL procedures cannot be called from triggers.
B) SQL procedures support the PRINT statement.
C) SQL procedures may return multiple result sets to the caller or to a client application.
D) SQL procedures reside outside of the database for easy portability.
E) SQL procedures support recursion.

4. Which statement is true about the NUMBER data type?

A) In DB2, the NUMBER data type has maximum precision of 31; in Oracle, it has a maximum precision of 38.
B) Declaring a column as NUMBER(6,8) is valid both in Oracle and in DB2 provided the DB2 database was created in Oracle compatibility mode.
C) In DB2, the NUMBER data type is the same as in Oracle, provided the DB2 database was created in Oracle compatibility mode.
D) Declaring a column as NUMBER(10,-2) is valid both in Oracle and in DB2 provided the DB2 database was created in Oracle compatibility mode.

5. Which of the following CURSOR declare statement is incorrect?

A) DECLARE c1 ASENSITIVE CURSOR WITH RETURN TO CLIENT FOR SELECT * FROM tab1
B) DECLARE c1 CURSOR WITHOUT RETURN FOR SELECT * FROM tab1
C) DECLARE c1 INSENSITIVE CURSOR WITH RETURN TO CLIENT FOR SELECT * FROM tab1
D) DECLARE c1 SENSITIVE CURSOR WITH RETURN TO CLIENT FOR SELECT * FROM tab1

Solutions: