You have been recently hired as a database administrator. Your senior manager asks you to study the production database server and submit a report on the settings done by the previous DBA.  While observing the server settings， you find that the following parameter has been set in the parameter file of the database：  REMOTE_OS_AUTHENT = TRUE  What could have been the reason to set this parameter as TRUE？（）

You have 100 segments in the USERS tablespace. You realize that the USERS tablespace is running low on space.  You can use Segment Advisor to （）

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Exhibit： View the Exhibit.You have more than one table in the recycle bin having the same original name， DEPT2. You do not have any table with the nameDEPT2 in your schema. You executed the following command：PURGE TABLE dept2； Which statement is correct in this scenario？（）

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You want to drop the TBS1 tablespace from your database.  You also want to delete the corresponding data files automatically， and not have to do it manually.  What should you do？（）

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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：（）

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Your database has a backup that was taken yesterday （Tuesday） between 13：00 and 15：00 hours. This is the only backup you have. You have lost all the archived redo logs generatedsince the previous Monday， but you have archived redo logs available from the previous Sunday and earlier. You now need to restore your backup due to database loss.  To which point can you restore your database？（）  

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You have lost all your RMAN backup set pieces due to a disk failure. Unfortunately， you have an automated cross-check script that also does a delete expired backupset command. You have restored all the backup set pieces from tape.  What command would you use to get those backup set pieces registered in the recovery catalog and the control file of the database again？（）  

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You have a production instance running on your server. UNDO_RETENTION is not long enough to satisfy read-consistency requirements. How do you change the UNDO_RETENTION value？（）

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You have enabled backup optimization in RMAN. You issue the following RMAN command to configure a redundancy-based retention policy：   CONFIGURE RETENTION POLICY TO REDUNDANCY 3；   Which statement is true？（）  

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You enabled the flashback logging feature， but you have not specified the location of the flash recovery area.  Which location would be used as the default location for the flash recovery area？（）

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You work as a database administrator for Certkiller .com. In your Oracle database10g installation you have set ORACLE_BASE to /u01/app/oracle.  Which objective will be achieved by this setting？（）

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