OCP 11G认证考试单项选择题每日一练(2019.01.13)

A.alter database controlfile autobacku on
B.alter system controlfile autobackup on 
C.configure controlfile autobackup on 
D.enable controlfile autobackup

A.It can have a maximum of five expressions in a list 
B.It returns the highest NOT NULL value in the list for all rows 
C.It requires that all expressions in the list must be of the same data type 
D.It requires that at least one of the expressions in the list must have a NOT NULL value

A. Oracle uses statistical relevance to determine when an adaptive threshold has been breached for the metric.
B. The statistics for the metric values observed over the baseline time period are not examined to determine threshold values.
C. Oracle determines when an adaptive threshold has been breached based on the maximum value captured by the baseline.
D. The total concurrent number of threshold violations, which must occur before an alert is raised for the metric, has been set to zero.

A. It checks the database for intrablock corruptions only.
B. It checks for block corruption in the valid backups of the database.
C. It checks the database for both intrablock and interblock corruptions.
D. It checks for only those corrupted blocks that are associated with data files.

A. Mount the database
B. Open the database in NORMAL mode
C. Open the database in RESTRICTED mode
D. Open the database with the RESETLOGS option