单选题What is the correct order of steps to perform an online database backup？（）   a. alter database begin backup b. alter database end backup c. Back up the database datafiles d. Back up the archive log files e. alter system switch logfileA a， b， c， d， eB e

第1题：

Consider the recovery steps in each of the cases given below：  Case 1：  Shut down the database and perform a backup.  Restore all the data files.  Mount the database.  Recover the database.  Without applying all the redo log files， open the database using the RESETLOGS option.  Back up the database.  Case 2：  Shut down the database and perform a backup.  Restore only the data files of the tablespace where user error damaged the data.  Mount the database.  Recover the database.  Open the database with the RESETLOGS option.  Back up the database.  Case 3： Shut down the database  Restore the data files  Open the database  Perform recovery to the current point in time.  Which case has the correct steps for an incomplete recovery？（）

• A、only case 1
• B、only case 2
• C、only case 3
• D、case 1 and 2
• E、case 2 and 3
• F、case 1 and 3
• G、all cases： case 1， case 2 and case 3

第2题：

You are working on a database that must be functioning 24 hours a day， 7 days a week. The databaseis configured in ARCHIVELOG mode.  Which two options do you have for performing user-managed backups（）

• A、You can perform consistent backups only.
• B、You can perform a complete database backup without shutting down the database instance.
• C、You can back up data files only when all data files have the same SCN recorded in the control file.
• D、You can back up only those data files whose headers are frozen by using ALTER TABLESPACE BEGINBACKUP or ALTER DATABASE BEGIN BACKUP commands.

第3题：

第4题：

Which are the correct steps， in order， to deal with the loss of an online redo log if the database has not yet crashed？（）   a. Issue a checkpoint.  b. Shut down the database.  c. Issue an alter database open command to open the database.  d. Startup mount the database.  e. Issue an alter database clear logfile command.  f. Recover all database datafiles.

• A、a， b， c， d
• B、b， d， e， c
• C、a， b， d， e， c
• D、b， f， d， f， c
• E、b， d， a， c

第5题：

You have lost all your SYSTEM tablespace datafiles （system_01.dbf and system_02.dbf） nd the database has crashed.  What would be the appropriate order of operations to correct the situation？（）   a. Mount the database with the startup mount command.  b. Take the SYSTEM datafile offline with the alter database command.  c. Restore the SYSTEM_01.dbf datafile from backup media with the required archived redo logs.  d. Restore all SYSTEM tablespace-related datafiles from backup media. e. Issue the recover tablespace SYSTEM command.  f. Issue the recover datafile SYSTEM_01.dbf command.  g. Open the database with the alter database open command.  h. Open the database with the alter database open resetlogs command.

• A、a， c， f， g
• B、b， d， e， h
• C、a， b， c， f， g
• D、d， a， e， g
• E、b， c， f， e， g

第6题：

If a log file becomes corrupted， it may cause the database to stall. How would you correct such a situation？（）  

• A、 Recover the online redo log from backup.
• B、 Delete and re-create the log file.
• C、 Use the alter database clear logfile command to clear the log file.
• D、 Shut down the database and restart it.
• E、 Shut down the database and then mount it. Clear the log file with the alter database clear logfile command and then restart the database with alter database open resetlogs.

第7题：

Your database is in NOARCHIVELOG mode. You start to do a backup， but your users complain that they dont want you to shut down the database to perform the backup. What options are available to you？（）  

• A、 Put the database in hot backup mode and perform an online backup，including backing up the  archived redo logs.
• B、 Just back up the database datafiles without shutting down the database.
• C、 You will have to wait until you can shut down the database to perform the backup.
• D、 Mark each datafile as backup in progress， back them up individually，and then mark them as backup not in progress. No archived redo logs will need to be backed up.
• E、 Only back up the datafiles that the user will not be touching. Once the user has finished what they were doing，you can shut down the database and back up the datafiles the user changed during the  course of the remaining backup

第8题：

You executed the following command to perform a backup of the USERS tablespace：  SQL> ALTER TABLESPACE users BEGIN BACKUP； ALTER TABLESPACE users BEGIN BACKUP *  ERROR at line 1：  ORA-01123： cannot start online backup； media recovery not enabled  What could be the reason for this error（）

• A、The MTTR Advisor is disabled.
• B、The database is in NOARCHIVELOG mode.
• C、The tablespace is already in backup mode.
• D、The Flash Recovery Area is not configured.

第9题：

When performing an online backup，what is the proper order of the following steps？（）   a. Issue the alter database end backup command. b. Back up the archived redo logs. c. Issue the alter database begin backup command.  d. Back up the database files.  e. Determine the beginning log sequence number. f. Determine the ending log sequence number.  g. Force a log switch with the alter system switch logfile command.

• A、a， b， c， d， e， f， g
• B、c， d， a， b， e， g， f
• C、f， d， b， g， a， c， e
• D、e， c， d， a， g， f， b
• E、a， f， b， g， e， c， d

第10题：

Which command will result in a trace file being created with the create controlfile command contained in it？（）  

• A、 alter database backup controlfile
• B、 alter database backup controlfile to trace
• C、 alter database controlfile backup
• D、 alter database controlfile backup to ’/ora01/oracle/ctrl_backup.ctl’
• E、 alter database begin controlfile backup