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IBM Assessment: DB2 9.7 Advanced DBA for LUW Sample Questions:

1. Table T1 was created by executing the following statement:

Immediately after creation, table T1 was populated with 10 rows. Later, user USER1 ran an application that inserted 100,000 rows into table T1. The following query is frequently ran against the T1 table:
SELECT deptno, empno, deptname FROM t1 WHERE deptno = 'EN' AND empno = '123' Assuming current statics exist for the table and index, which index will provide optimal performance for this query?

A) CREATE INDEX idx1 ON t1 (deptno) INCLUDE (empno)
B) CREATE INDEX idx1 ON t1 (deptno, empno)
C) CREATE INDEX idx1 ON t1 (deptno)
D) CREATE INDEX idx1 ON t1 (deptno, empno) INCLUDE (deptname)

2. A database and a table space were created using the following commands:

Afterwards, two tables were created in table space TBSP1 and both tables were populated with 100,000 rows. If a DBA decides that database MYDB should use automatic storage, which command(s) are needed to convert both the database and table space TBSP1?

A) ALTER DATABASE mydb AUTOMATIC STORAGE YES ON ?mnt/path_1? ?mnt/path_2? ALTER TABLESPACE tbsp1 MANAGED BY AUTOMATIC STORAGE;
B) ALTER DATABASE mydb ADD STORAGE ON ?mnt/path_1? ?mnt/path_2?
C) ALTER DATABASE mydb ADD STORAGE ON ?mnt/path_1? ?mnt/path_2? ALTER TABLESPACE tbsp1 MANAGED BY AUTOMATIC STORAGE;
D) ALTER DATABASE mydb AUTOMATIC STORAGE YES ON ?mnt/path_1? ?mnt/path_2?

3. Which option of the REORG TABLE statement will release blocks that contain no rows from a multi-dimensional clustering (MDC) table?

A) RELEASE FREE EXTENTS ONLY
B) RECLAIM EXTENTS ONLY
C) RELEASE FREE BLOCKS ONLY
D) RECLAIM FREE BLOCKS

4. Table TAB1 was created using the following statement: CREATE TABLE tab1 (c1 INT, c2 INT, c3 INT, c4 INT, c5 INT); If column C1 is unique and queries typically access columns C1, C2, C3 and C4 together, which statement(s) will create index(es) that will provide optimal query performance?

A) CREATE UNIQUE INDEX xtab1 ON tab1 (c3) INCLUDE (c1, c2, c4);
B) CREATE UNIQUE INDEX xtab1 ON tab1 (c1) INCLUDE (c2, c3, c4);
C) CREATE UNIQUE INDEX xtab1 ON tab1 (c4, c3, c2, c1);
D) CREATE UNIQUE INDEX xtab1 ON tab1 (c1); CREATE INDEX xtab2 ON tab1 (c2) INCLUDE (c3, c4);

5. What steps, in the correct order, are performed by the SQL and XQuery compilers to generate executable code for non-federated queries?

A) parse query; check semantics; rewrite query; build access plan
B) parse query; rewrite query; check semantics; pushdown predicates; execute access plan
C) check semantics; parse query; build access plan; pushdown predicates; execute access plan
D) check semantics; parse query; rewrite query; build access plan

Solutions: