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 in ARCHIVELOG mode. You have two online redo log groups，each of which contains one redo member. When you attempt to start the database， you receive the following errors：（）A ALTER DATABASE DROP LOGFILE GROUP 1B ALTER DATABASE CLEAR LOGFILE GROUP 1C ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 1D ALTER DATABASE DROP LOGFILE MEMBER ’D:///REDO01.LOG’
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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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