053(三十一）

151、

151.Which statements about the MEMORY_TARGET initialization parameter are true? (Choose all that apply.)
A. MEMORY_TARGET can be increased up to the value of MEMORY_MAX_TARGET, if MEMORY_MAX_TARGET is set to a value greater than zero 
B. MEMORY_MAX_TARGET defaults to a value of zero if MEMORY_TARGET is not set
C. MEMORY_TARGET represents the total amount of memory that can be allocated to SGA and PGA memory structures.
D. MEMORY_TARGET is static and cannot be modified without shutting down the instance

152、

152.You are performing incomplete recovery using RMAN. You execute the following RUN block:
RUN
{
SET UNTIL SCN 1107600;
RESTORE DATABASE;
RECOVER DATABASE;
}
Which statement is true about the result?
A.RMAN restores all datafiles from the most recent backup available since the failure and applies the redo logs necessary to recover the database to SCN 1107600
B.RMAN restores all datafiles needed to restore the database through SCN 1107599 and applies the redo logs necessary to recover the database through SCN 1107599.
C.RMAN restores all datafiles and control files from the most recent backup
D.The RUN block fails because you did not specify an UNTIL clause in your RECOVER DATABASE command

Answer: C

153、

153.You are managing an ASM instance. You previously issued the following statements:
ALTER DISKGROUP dg1 DROP DISK disk2;
ALTER DISKGROUP dg1 DROP DISK disk3;
ALTER DISKGROUP dg1 DROP DISK disk5;
You want to cancel the disk drops that are pending for the DG1 disk group. Which statement should you issue?
A. ALTER DISKGROUP dg1 UNDROP disk2, disk3, disk5;
B. ALTER DISKGROUP dg1 UNDROP;
C. ALTER DISKGROUP dg1 UNDROP DISKS;
D. You cannot cancel the pending disk drops.

Answer: C

154、A database is running in ARCHIVELOG mode and regular backups are performed. A user receives the following error message:

Which is the recommended sequence of operations you need to perform for the query successfully?
A. Drop the affected tablespace, re-create the tablespace, restore the datafiles, and the tablespace.
B. Take the affected datafile offline (if not already offline), restore the damaged image of the datafile, and then bring it online.
C. Restart the database in MOUNT mode, restore the damaged datafile, recover the datafile and then open the database with resetlogs.
D. Put the database in RESTRICTED mode, restore all the datafiles in the affected datafile and recover the tablespace, and then put the database in normal operational mode.

Answer: C

C答案，可以直接打开数据库。

155、Observe the structure of the table employees: The table contains 8475 records.

One of the employees wants to know the names of all employees of the company. For this, he fires the following query:
SELECT * FROM EMPLOYEES ORDER BY emp_fname;
Since the operation performed on executing the query cannot fit into memory, it requires disk space to 
complete the operation. Which of the following types of segments will Oracle allocate to complete the 
operation and to provide the required result?
A. Rollback segment
B. Temporary segment
C. Data segment
D. Index segment

Answer: B 

排序需要用到临时表空间