You are the Database Administrator for WonderWeb， which has recently acquired a media company TXGlobal. You have been assigned the task to migrate all the database applications of TXGlobal to the database server of WonderWeb. To accommodate more database applications， you need to add disks to the existing disk group. Whenever you add or remove disks from the disk group， Automatic Storage Management （ASM） rebalancing distributes the data evenly across all the disks of the disk group. Which background process performs this actual rebalancing activity， resulting in the movement of data extents in the disk groups？（）  

单项选择题Consider the following configuration：   devices diskP1 is a member of disk group grp1.        devices diskP2 is a member of disk group grp1.        devices diskP3 is a member of disk group grp1.        devices diskP4 is a candidate disk.        devices diskQ1 is a member of disk group grp2.        devices diskQ2 is a member of disk group grp2.        devices diskQ3 is a member of disk group grp2.        devices diskQ4 is a candidate disk.   Which command will add the disk  devices diskP4 to the disk group， grp1？（）

A. ALTER DISKGROUP grp1  ADD DISK ’/devices/diskP1’，  ADD DISK ’/devices/diskP4’；
B. ALTER DISKGROUP grp1  ADD DISK ’/devices/disk*4’；
C. ALTER DISKGROUP grp1  ADD DISK ’/devices/diskP*’；
D. ALTER DISKGROUP grp1  ADD DISK ’/devices/diskQ*’，  ADD DISK ’/devices/diskP*’；

单项选择题YouaremaintainingtheSALESdatabaseonOracle10g.Youhaveaddedanewdisktoadiskgroup.AutomaticStorageManagementperformstherebalancingactivity.Youwanttospeeduptherebalancingactivity.Whichparameterwillyouspecifytocontrolthespeedoftherebalancingactivity？（）

A. ASM_POWER_LIMIT
B. ASM_DISKSTRING
C. ASM_DISKGROUPS
D. LARGE_POOL_SIZE

单项选择题WhichstatementwillNOTcreateatablespace？（）

A. CREATE TABLESPACE DATA1 DATAFILE ’+grp1/abc（datafile）’；
B. CREATE TABLESPACE DATA1 DATAFILE ’+grp1’；
C. CREATE TABLESPACE DATA1 DATAFILE ’+data1（tempfile）’；
D. CREATE TABLESPACE DATA1 DATAFILE ’+grp1.256.34359’；

单项选择题YouaremaintainingyourdatabaseinOracle10g.YousetthevalueoftheUNDO_RETENTIONinitializationparametertozerointheinitializationparameterfile.Whatwillbetheimpactofspecifyingthissetting？（）

A. The database will not start.
B. The database will start but will not retain the undo data in the undo segment.
C. The database will start， and the undo segment will contain the undo data for at least one hour.
D. The database will start， and the undo segment will retain the undo data for at least 15 minutes.

单项选择题YouusetheMemoryAdvisortotunethememorystructuresofyourdatabase.WhatistheprerequisitetousetheMemoryAdvisor？（）

A. The database must be in the ARCHIVELOG mode.
B. The automatic memory tuning must be enabled.
C. The change tracking feature must be enabled.
D. The automatic memory tuning must be disabled.