单选题Your database is set in NOARCHIVELOG mode and is backed up every night. There are 10 redo log groups on the database， each with three members， making a total of 30 redo log files. At lunchtime the server unexpectedly gets shut down. Upon restarting you notice that the data file belonging to the SYSTEM tablespace has become corrupted. You also notice that there have been 15 log switches during the day. Which solution should you use to recover as much committed data as possible？（）ARestore the data file for the SYSTEM tablespace then open the database. BRestore all redo logs form last night's backup, then restart the database. CPerform a complete restore of all files from last night's backup. Data entered into the database today must be reentered. DMount the instance, take the SYSTEM tablespace offline, open the database, and then restore the data file, recover it, and bring the tablespace online.
单选题
Your database is set in NOARCHIVELOG mode and is backed up every night. There are 10 redo log groups on the database， each with three members， making a total of 30 redo log files. At lunchtime the server unexpectedly gets shut down. Upon restarting you notice that the data file belonging to the SYSTEM tablespace has become corrupted. You also notice that there have been 15 log switches during the day. Which solution should you use to recover as much committed data as possible？（）
A
Restore the data file for the SYSTEM tablespace then open the database.
B
Restore all redo logs form last night's backup, then restart the database.
C
Perform a complete restore of all files from last night's backup. Data entered into the database today must be reentered.
D
Mount the instance, take the SYSTEM tablespace offline, open the database, and then restore the data file, recover it, and bring the tablespace online.
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单选题Your database is set in NOARCHIVELOG mode and is backed up every night. There are 10 redo log groups on the database， each with three members， making a total of 30 redo log files. At lunchtime the server unexpectedly gets shut down. Upon restarting you notice that the data file belonging to the SYSTEM tablespace has become corrupted. You also notice that there have been 15 log switches during the day. Which solution should you use to recover as much committed data as possible？（）ARestore the data file for the SYSTEM tablespace then open the database. BRestore all redo logs form last night's backup, then restart the database. CPerform a complete restore of all files from last night's backup. Data entered into the database today must be reentered. DMount the instance, take the SYSTEM tablespace offline, open the database, and then restore the data file, recover it, and bring the tablespace online.
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单选题A redo log file is corrupted while the database is open； as a consequence， database operations are stopped because archiving cannot continue. What would you do to solve the problem？（）A clear the redo log groupB perform redo log file importC perform an incomplete recoveryD perform a redo log recovery using Recovery Manager （RMAN）E shut down the database and open the database in the NOARCHIVELOG mode
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单选题You are maintaining your OLTP database in Oracle10g. While observing the performance of the database， you find that the log switch occurs more than once for every 20 minutes， affecting the database performance. Which factor is responsible for frequent log switches？（）Athe value of the UNDO_RETENTION initialization parameterBthe value of the optimal redo log file size provided by the Redo Logfile Size AdvisorCthe online redo log files sizeDthe number of redo log members in a group
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