An operator is asked to verify the exact location of the default JRE binary. The following commands were run: $ which java /usr/bin/java $ ls -l /usr/bin/java lrwxrwxrwx 1 root other 23 Jan 27 2006 /usr/bin/java -> ../jre1.5.0_06/bin/java Based on the command outputs above, what is the path to the java executable file?（）

A、/usr/bin/java

B、/usr/jre1.5.0_06/bin/java

C、/usr/bin/jre1.5.0_06/bin/java

D、/usr/bin/java/jre1.5.0_06/bin/java

What are two requirements when using Packet Flow Acceleration? （）(Choose two.)

Traffic needs be compressed.

Quality of service must be enabled.

A service tunnel must exist in at least one direction.

PFA must be enabled on the client-side WX device.

You want to perform the database backup when user activity on your system is low, such as between 12:00 a.m. and 2:00 am. Which command terminates with an error if the backup is not complete at the end of the specified duration?（）

A、RMAN> BACKUP DURATION 2:00 MINIMIZE LOAD DATABASE

B、RMAN> BACKUP DURATION 2:00 PARTIAL FILESPERSET 1 DATABASE

C、RMAN> BACKUP DURATION 2:00 PARTIAL MINIMIZE TIME DATABASE 

D、RMAN> BACKUP AS COPY DURATION 2:00 PARTIAL MINIMIZE LOAD DATABASE

Company.com has a three-node cluster with six resource groups. There are two resource groups  for each node. A new hardware component will be added to one of the nodes. The customer wants to move the resource groups to other nodes，but not necessarily in the normal fallover order. Also，the resource groups must be moved at night when there is no one in the computer center. What can be done so that the resource group is moved at the most convenient normal fallover order. Also，the resource groups must be moved at night when there is no one in the computer center.  What can be done so that the resource group is moved at the most convenient time for the customer？（）   

A、 Create a custom resource group with a custom fallback timer to cause the system shutdown at he appropriate time.

B、 Set the system to stop with shutdown command at the appropriate time and allow HACMP to relocate the resources.

C、 Use a script that calls the cIRGmove command and place it in the cron or a queue to execute at the appropriate time.

D、 Change the existing resource groups to a custom type and add a timer to perform a shutdown -h command at the appropriate time.

N是自然数集合，定义f：N→N，f（x）＝xmod3，则f是（　　）。

A、满射不是单射

B、单射不是满射

C、双射

D、不是单射也不是满射

You need to ensure that the database users should be able to use the various flashback query features in order to go back in time by four hours. What would you do to achieve this?（）

set SQL_TRACE=True 

set UNDO_RETENTION=14400 

set FAST_START_MTTR_TARGET=240 

set LOG_CHECKPOINT_INTERVAL=240 

set DB_FLASHBACK_RETENTION_TARGET=14400 

set the RETENTION GUARANTEE clause for the undo tablespace