A.m.的含义是（）A、饭前B、饭后C、睡前D、上午E、下午
A.m.的含义是（）
- A、饭前
- B、饭后
- C、睡前
- D、上午
- E、下午
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The application workload on your database is same between 10 a.m. and 11 a.m. on weekdays. Suddenly you observe poor performance between 10 a.m. and 11 a.m. in the middle of the week. How would you identify the changes in configuration settings， workload profile，and statistics to diagnose the possible causes of the performance degradation？（）A、by using the SQL access advisorB、by using the Automatic Workload Repository reportC、by running the Automatic Database Diagnostic Monitor （ADDM）D、by using the Automatic Workload Repository Compare Period reportE、by analyzing the output of the V$ACTIVE_SESSION_HISTORY view
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单选题You backed up the database at 8 a.m. today using an online backup. Accounting made a large change to the underlying data between 10 a.m. and noon. Which of the following actions would ensure that the changes could be recovered using the 8 a.m. backup？（）A Create a manual incremental online database backup.B Back up all the archived redo logs generated since the 8 a.m. backup.C Create a brand-new backup after all the changes have been applied.D There is no way to make the changes recoverable based on the 8 a.m. backup.E Perform an online backup of the tablespace（s） that contained changed data.
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单选题The current time is 12：00 noon. You want to recover the USERS tablespace from a failure that occurred at 11：50 a.m. You discover that the only member of an unarchived redo log group containing information from 11：40 a.m. onwards is corrupt. With reference to this scenario， if you are not using Recovery Manager （RMAN）， which recovery method would you use？（）A time-based recoveryB log sequence recoveryC cancel-based recoveryD change-based recovery
单选题Your database operates in ARCHIVELOG mode and user/x7fmanaged consistent backups are performed every Sunday night. On Tuesday， at 9：00 a.m. the current log sequence number was 369. Also， on Tuesday you lost the data file belonging to the SYSTEM tablespace and an archivelog file （sequence number 356） that contained redo entries between 8：00 a.m. and 8：30 a.m. With reference to this scenario， what would you do to recover the database？（）Arestore all the data files from last Sunday’s backup， and then perform a timebased recoveryBrestore all the data files from last Sunday’s backup， and then perform a cancelbased recoveryCrestore all the data files from last Sunday’s backup， and then perform a changebased recoveryDrestore only data files that belong to the SYSTEM tablespace from last Sunday’s backup， and then perform a complete recovery
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单选题A.m.的含义是（）A饭前B饭后C睡前D上午E下午