多选题You work as a database administrator for Supportcenter.cn. Your database is opened inNOARCHIVEKLOG mode. You decide to place the database in ARCHIVELOG mode. How would you do this？（）AExecute the ALTER DATABASE ARCHIVELOG statementBSelect ARCHIVELOG opt

第1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: ORA-00313: open failed for members of log group 1 of thread 1 ORA-00312: online log 1 thread 1: 'D:/REDO01.LOG' You discover that the online redo log file of the current redo group is corrupted. Which statement should you use to resolve this issue?（）

• A、ALTER DATABASE DROP LOGFILE GROUP 1;
• B、ALTER DATABASE CLEAR LOGFILE GROUP 1;
• C、ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 1;
• D、ALTER DATABASE DROP LOGFILE MEMBER 'D:/REDO01.LOG

第2题：

The database is running in the ARCHIVELOG mode. It has three redo log groups with one member each. One of the redo log groups has become corrupted. You have issued the following command during the recovery of a damaged redo log file：   ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 3；   Which action should you perform immediately after using this command？（）  

• A、 You should perform a log switch
• B、 You should make a backup of the database
• C、 You should switch the database to the NONARCHIVELOG mode
• D、 You should shut down the database instance and perform a complete database recovery

第3题：

第4题：

You are managing an Oracle Database 11g database. You configured the database to run in ARCHIVELOGmode.  Which two statements are true in this scenario（）

• A、You must shut down the database instance to perform the backups.
• B、You must configure the Flash Recovery Area （FRA） for the database.
• C、You can perform complete database backups without closing the database.
• D、All the previous closed database backups including control files become invalid after you configure thedatabase to ARCHIVELOG mode.

第5题：

Your database is running in ARCHIVELOG mode. You are performing a user-managed backup of the DATA1 tablespace.  You place the DATA1 tablespace in backup mode by issuing the following statement：   ALTER TABLESPACE data1 BEGIN BACKUP；   While you are performing the backup， an error occurs that causes the instance to terminate abnormally. Which statement about the DATA1 tablespace is true？（）  

• A、 The DATA1 tablespace is automatically taken out of backup mode when the instance aborts.
• B、 If you restart the database，the DATA1 tablespace will be automatically taken out of backup mode  when the database is opened.
• C、 If you restart the database，the DATA1 tablespace will be automatically taken out of backup mode  when the database is mounted.
• D、 If you restart the database，the database will not be opened.

第6题：

You want to make sure that your database backup does not exceed 10 hours in length. What command would you issue that would meet this condition?（）

• A、backup database plus archivelog
• B、backup database plus archivlog until time ‘10:00‘
• C、backup database plus archivelog timeout ‘10:00‘
• D、backup database plus archivelog duration 10:00

第7题：

Your Certkiller .com database is in ARCHIVELOG mode. The data file that belongs to the SYSTEMtablespacehas become corrupted. Up to what point can you recover the database？（）

• A、Until last commit
• B、Until the time you perform recovery
• C、Until the time the date file got corrupted
• D、Until the point where the last transaction begun
• E、You cannot recover the SYSTEMtablespaceand must re-create the database.

第8题：

You are maintaining a database that is in ARCHIVELOG mode. You have configured the flash recovery area in your database. The database is in MOUNT EXCLUSIVE mode， and you want to configure the Flashback Database feature. Which two options are NOT required to configure the Flashback Database feature？ （）

• A、 Open the database in read-only mode.
• B、 Set the retention target with the DB_FLASHBACK_RETENTION_TARGET initialization parameter.
• C、 Enable the block change tracking feature.
• D、 Execute the ALTER DATABASE FLASHBACK ON statement.

第9题：

Which two statements are true regarding the database in ARCHIVELOG mode？（）

• A、You have to shut down the database to perform the backups.
• B、Archiving information is written to the data files and redo log files.
• C、You can perform complete database backups without closing the database.
• D、Online redo log files have to be multiplexed before putting the database in ARCHIVELOG mode.
• E、All the previous database backups become invalid after you configure the database to ARCHIVELOG mode.

第10题：

Your Supportcenter.cn database is in ARCHIVELOG mode. The data file that belongs to the SYSTEM tablespace has become corrupted. Up to what point can you recover the database？（）

• A、Until last commit
• B、Until the time you perform recovery
• C、Until the time the date file got corrupted
• D、Until the point where the last transaction begun
• E、You cannot recover the SYSTEMtablespaceand must re-create the database.