1Z0-048試験問題集
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1Z0-048
1.Which optional parameter of the DESCRIPTION clause of a TNS entry can you use to randomizethe access to available listeners?
A.FAILOVER
B.LOAD_BALANCE
C.SOURCE_ROUTE
D.TYPE_OF_SERVICE
Correct:B
2.You are working as a DBA in a RAC environment that is available for testing. The RAC
environment has all the database files stored in the OCFS file system. You plan to install ASM and
move all the database files to ASM to achieve better performance. During the installation, you
selected redundancy level as normal for the disk group being added. What is the reason for
selecting this redundancy level?
A.You want to use hardware mirroring.
B.You do not want to have any mirroring in the disk group.
C.You have two failure groups defined, so you want to use two-way mirroring.
D.You have three failure groups defined, so you want to use three-way mirroring.
Correct:C
3.You are running a two-instance database with six redo log groups defined and decide to add a
third thread to support a third database instance on the third node of the cluster. Which three
commands would you issue to achieve this using command line administration? (Choose three.)
A.ALTER SYSTEM ENABLE THREAD 3;
B.ALTER DATABASE ENABLE THREAD 3;
C.ALTER SYSTEM ADD LOGFILE THREAD 3 GROUP 8;
D.ALTER SYSTEM ADD LOGFILE THREAD 3 GROUP 7;
E.ALTER DATABASE ADD LOGFILE THREAD 3 GROUP 7;
F.ALTER DATABASE ADD LOGFILE THREAD 3 GROUP 8;
Correct:B E F
4.Which initialization parameter would you use for each RAC instance to make sure that each
listener on each RAC node is aware of the load of all the others?
A.LOCAL_LISTENER
B.REMOTE_LISTENER
C.REMOTE_DEPENDENCIES_MODE
D.PREFER_LEAST_LOADED_NODE_
Correct:B
5.You have a well-tuned, non-RAC single instance Oracle database with several services, all of
which perform perfectly. You plan to migrate the database to RAC in the next two weeks and all file
systems would be shared using Oracle Cluster File System. After the migration, you want to
perform a test to monitor RAC-specific tuning issues that would not have occurred on a non-RAC
database. Which six areas would you monitor to determine whether there are RAC-specific
performance problems after migration? (Choose six.)
A.Interconnect latency
B.Instance recovery time
C.Services with applications that use external tables
D.Services with applications that truncate large tables
E.Services with applications using local context variables
F.Services with query-intensive applications relying on full table scans
G.Services with insert-intensive applications that use Oracle sequences for index keys
H.Services with applications that have occasional queries, using index access on modestly sized tables
I.Services with insert-intensive applications that generate their own keys without Oracle sequences
Correct:A B D F G I
6.After a power failure, you noticed that one of your cluster database instances did not start
automatically, whereas all other instances came up successfully. What would you do to determine
the precise cause for the instance startup failure? (Choose three.)
A.Check the resource state by using the CRS_STAT command.
B.Check for OCR corruptions by using the OCRCHECK command.
C.Check the alert.log file that belongs to the instance that did not start.
D.Check the alert.log file that belongs to the Oracle Clusterware software.
E.Check if the Oracle Clusterware is functional by using the CRSCTL command.
F.Reboot the node where the failing instance resides to check if the problem is persistent.
G.Enable extra debugging in the Oracle Clusterware software by using the CRSCTL command.
Correct:A C D