IBM DB2 A2090-730

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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 5 INCREMENT BY 5 CACHE 5
User1 successfully executes the following statements in Connection1: VALUES NEXT VALUE FOR my_seq INTO :con1hvar VALUES NEXT VALUE FOR my_seq INTO :con1hvar User2 successfully executes the following statement in Connection2: VALUES NEXT VALUE FOR my_seq INTO :con2hvar
After User1 & User2 are finished, User3 executes the following statement in Connection3:
SELECT NEXT VALUE FOR my_seq FROM sysibm.sysdummy1
Which value will be returned by the query?

A) 20
B) 25
C) 55
D) 50

2. The following triggers were defined for a table named SALES in the order shown:
CREATE TRIGGER trigger_a NO CASCADE BEFORE UPDATE ON sales REFERENCING NEW AS new FOR EACH ROW SET new.commission = sale_amt * .05 WHERE invoice = n.invoice;
CREATE TRIGGER trigger_b AFTER INSERT ON sales REFERENCING NEW AS new FOR EACH ROW UPDATE sales SET bill_date = CURRENT DATE + 30 DAYS WHERE invoice = n.invoice;
CREATE TRIGGER trigger_c NO CASCADE BEFORE DELETE ON sales FOR EACH ROW SIGNAL SQLSTATE '75005' SET MESSAGE_TEXT = 'Deletes not allowed!';
Which of the following statements is NOT true?

A) Whenever a row in the SALES table is updated, all three triggers are fired but nothing happens because none of the triggers have been coded to trap update operations
B) Once a row has been added to the SALES table, it cannot be removed
C) Whenever a row is inserted into the SALES table, the value in the BILL_DATE column is automatically set to 30 days from today
D) Each time a row is inserted into the SALES table, trigger TRIGGER_A is fired first, followed by trigger TRIGGER_B

3. An application has acquired a Share lock on a row in a table and now wishes to update the row. Which of the following statements is true?

A) The application must release the row-level Share lock it holds and acquire an Update lock on the row
B) The row-level Share lock will automatically be escalated to a table-level Update lock
C) The application must release the row-level Share lock it holds and acquire an Update lock on the table
D) The row-level Share lock will automatically be converted to a row-level Update lock

4. Given the following set of statements:
CREATE TABLE tab1 (col1 INTEGER, col2 CHAR(20));
COMMIT;
INSERT INTO tab1 VALUES (123, 'Red');
INSERT INTO tab1 VALUES (456, 'Yellow');
SAVEPOINT s1 ON ROLLBACK RETAIN CURSORS;
DELETE FROM tab1 WHERE col1 = 123;
INSERT INTO tab1 VALUES (789, 'Blue');
ROLLBACK TO SAVEPOINT s1;
INSERT INTO tab1 VALUES (789, 'Green');
UPDATE tab1 SET col2 = NULL WHERE col1 = 789; COMMIT;
Which of the following records would be returned by the following statement?
SELECT * FROM tab1

A) COL1 COL2
456 Yellow 1 record(s) selected.
B) COL1 COL2
123 Red 456 Yellow 789 Green 3 record(s) selected.
C) COL1 COL2
123 Red 456 Yellow 2 record(s) selected.
D) COL1 COL2
123 Red 456 Yellow 789 3 record(s) selected.

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

A) Any row that is read during a unit of work cannot be changed by other application processes until the unit of work is complete.
B) Any row changed by another application process can be read, even if the change has not been committed by that application process.
C) An application process acquires at least a share lock on the current row of every cursor.
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.

Solutions: