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Question 16

Which three statements are true about inner and outer joins? (Choose three.)

A.A full outer join returns matched and unmatched rows
B.An inner join returns matched rows
C.Outer joins can only be used between two tables per query
D.A full outer join must use Oracle syntax
E.Outer joins can be used when there are multiple join conditions on two tables
F.A left or right outer join returns only unmatched rows

Question 17

The EMPLOYEES table contains columns EMP_ID of data type NUMBER and HIRE_DATE of data type DATE.
You want to display the date of the first Monday after the completion of six months since hiring.
The NLS_TERRITORY parameter is set to AMERICA in the session and, therefore, Sunday is the first day on the week.
Which query can be used?

A.SELECT emp_id, NEXT_DAY(ADD_MONTHS(hire_date, 6), 1) FROM employees;
B.SELECT emp_id, ADD_MONTHS(hire_date, 6), NEXT_DAY(`MONDAY') FROM employees;
C.SELECT emp_id, NEXT_DAY(MONTHS_BETWEEN(hire_date, SYSDATE), 6) FROM employees;
D.SELECT emp_id, NEXT_DAY(ADD_MONTHS(hire_date, 6), `MONDAY') FROM employees;

Question 18

Your database instance is started with a PFILE.
Examine these parameters:

You want to increase the size of the buffer cache.
Free memory is available to increase the size of the buffer cache.
You execute the command:
SQL> ALTER SYSTEM SET DB_CACHE_SIZE=1024M;
What is the outcome?

A.The value is changed for the current instance and in the PFILE
B.It fails because the SCOPE clause is missing
C.The value is changed only in the PFILE and takes effect at the next instance startup
D.Change is applied to the current instance, but does not persist after instance restart

Question 19

Which two are true about instance recovery for a database that is open in read write mode?
(Choose two.)

A.It always occurs during instance startup performed immediately after a SHUTDOWN ABORT.
B.It is always performed when opening a database.
C.The database opens after the roll forward phase of instance recovery has completed.
D.No users can log on until instance recovery has completed.
E.It is guaranteed to complete within fast_start_mttr_target number of seconds.
F.Only the CURRENT REDO log group is required to perform instance recovery.

Question 20

The CUSTOMERS table has a CUST_CREDIT_LIMIT column of data type NUMBER.
Which two queries execute successfully? (Choose two.)

A.SELECT NVL2(cust_credit_limit * .15, 'Not Available') FROM customers;
B.SELECT NVL2(cust_credit_limit, TO_CHAR(cust_credit_limit * .15), 'Not Available') FROM customers;
C.SELECT NVL(cust_credit_limit * .15, 'Not Available') FROM customers;
D.SELECT NVL(TO_CHAR(cust_credit_limit * .15), 'Not Available') FROM customers;
E.SELECT TO_CHAR(NVL(cust_credit_limit * .15, 'Not Available')) FROM customers;