单项选择题
What is the correct order of the following commands if you wanted to restore datafile 4， which was accidentally removed from the file system？（）
a. sql ’alter database datafile 4 online’
b. restore datafile 4
c. recover datafile 4
d. sql ’alter database datafile 4 offline’
e. startup
f. shutdown
A. a， c， b， d
B. d， b， c， a
C. f， d， b， c， a， e
D. c， a， b， d， f
E. a， b， d， e
相关考题
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单项选择题
You have a very large table that your users access frequently. Which of the following advisors will recommend any indexes to improve the performance of queries against this table?（）
A. The Automatic Memory Manager (AMM)
B. The SQL Tuning Advisor
C. The Segment Advisor
D. The SQL Access Advisor -
多项选择题
Which of the following cannot be used as input to the SQL Tuning Advisor?（） (Choose all that apply.)
A. A single SQL statement provided by a user
B. An existing SQL Tuning Set (STS)
C. A preprocessed Database Replay workload
D. A schema name
E. SQL statement identified in EM as using excessive resources -
单项选择题
While tuning a SQL statement, the SQL Tuning Advisor finds an existing SQL profile for the statement that has stale statistics available. What would the optimizer do in this situation?（）
A. It updates the existing SQL profiles with current statistics.
B. It makes the statistics information available to GATHER_STATS_JOB
C. It initiates the statistics collection process by running GATHER_STATS_JOB
D. It logs a warning message in the alert log so that the DBA can perform statistics collection manually.
