单项选择题

You have lost datafiles 1 and 3 from your database，and the database has crashed.
In what order should you perform the following steps to recover your database？（）
1. Take the datafiles that were lost offline.
2. startup mount the database
3. Issue the alter database open command.
4. Restore the datafiles that were lost
5. Recover the datafiles with the recover datafile command.
6. Bring the datafiles back online.
7. Recover the database with the recover database command.

A. 2，1，3，4，5，6
B. 2，4，5，3
C. 4，7，3
D. 2，4，7，3
E. 2，7，3

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单项选择题

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.

单项选择题

When you create a backup control file， where is the resulting file written to？（）

A. The database user dump destination directory
B. The database diagnostic destination directory
C. To $ORACLE_HOME/rdbms
D. To $ORACLE_HOME/admin
E. To the directory and filename you specify in the command

单项选择题

Which of the following statements is true when the database is in ARCHIVELOG mode and tablespaces are in hot backup mode？（）

A. Archive log generation is suspended until the tablespaces are taken out of hot backup mode.
B. Datafiles are not written to during hot backups.
C. Changes to the database are cached during the backup and not written to the datafiles to ensure that the datafiles are consistent when recovered.
D. The datafile headers are not updated during the backup.
E. The way data is written to the online redo logs is unchanged during the backup.