单项选择题
You have created a baseline metric， DISK_IO_BL， for the disk I/O metrics in your PROD database and you have been getting notifications whenever the database performance degrades. You optimize the database I/O to gain the performance and you decide to remove the baseline metrics. Which method would you use to remove the DISK_IO_BL baseline metrics？（）
A.The baseline， once created， cannot be removed.
B.Disable the baseline metrics in the Database Control Manage Metrics page.
C.The baseline will be automatically removed once the database performance has been optimized.
D.Drop the baseline metrics by usingDBMS_WORKLOAD_REPOSITORY.DROP_BASELINE procedure.
相关考题
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多项选择题
Exhibit. Which two options are used to enable the connect-time failover feature？（）
A.Use only the first address.
B.Try one address， selected at random.
C.Try each address， in order， until one succeeds.
D.Try each address， randomly， until one succeeds.
E.Use each address in order until destination reached. -
单项选择题
One of the users in the PROD database，Adams，complains that his update on the table，TRANS， is taking an unusually long time to complete. You find that the table gets locked by another database user before Adams starts his transactions，and you are unable to contact the user holding the table lock. As Adams is updating some crucial rows in the table， he should get the highest priority. Which method would you use to overcome this problem？（）
A.execute the command， ALTER SESSION KILL ..， to kill the blocking session
B.execute the DBMS_SESSION.KILL_SESSION procedure to kill the blocking session
C.execute the command， ALTER SYSTEM KILL SESSION ..， to kill the blocking session
D.execute the command， ALTER SESSION UNLOCK ..， to release the lock for the blocking session
E.execute the command， ALTER SYSTEM UNLOCK SESSION ..， to release the lock for the blocking session -
单项选择题
Whatadvantagewouldyougetifyouincreasethelengthoftimeduringwhichtheundoinformationwouldbestoredinthedatabase？（）
A.roll back of large transactions
B.roll forward to redo a transaction
C.data concurrency for large updates
D.read consistency for long-running transactions
