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？（）

Consider this RMAN command：   RMAN> CONFIGURE RETENTION POLICY CLEAR；   What is the effect of this command？（）

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Consider this syntax：   MERGE INTO t1  USING t2 ON （join predicate）…..   What does the MERGE syntax do？（）

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Your database instance is running with full workload after database creation. You have decided to useafixed-sizeundo tablespace. You want to use the Undo Advisor to estimate the capacity of the undotablespace.  Which two factors must you consider before using the Undo Advisor to estimate the capacity of the undotablespace（）

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Your database instance is running with full workload after database creation. You have decided to use a fixed-size undo tablespace. You want to use the Undo Advisor to estimate the capacity of the undo tablespace. Which two factors must you consider before using the Undo Advisor to estimate the capacity of the undotablespace（）

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Consider the following scenario： You have a directory， data， under the disk group tdgroupA. You want to create an alias for one of the data files and you execute the following command： ALTER DISKGROUP tdgroupA  ADD ALIAS ’+tdgroupA/data/datafile.dbf’  FOR ’+tdgroupA.231.45678’；  Which task would be accomplished by the command？（）

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Consider the following statement：   SQL> EXECUTE DBMS_STATS.GATHER_SHEMA_STATS （-  2> ownname => ‘OE’， -  3> estimate_percent => DBMS_STATS.AUTO_SAMPLE_SIZE， -  4> method opt => ‘for all columns size AUTO’）；   What is the effect of ‘for all columns size AUTO’ of the METHOD_OPT option？（）

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You work as a database administrator for Certkiller .com. You find that the database performance degrades while you backup the Certkiller database using Recovery Manager （RMAN）. The Certkiller database is running in shared server mode. The database instance is currently using 60% of total operating system memory. You suspect the shared pool fragmentation to be the reason.  Which action would you consider to overcome the performance degradation？（）

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Consider the following code snippet：   BEGIN  DBMS_SCHEDULER.SET_ATTRIBUTE （ name => ，，lne_job1， attribute => ，，job_priority， value => 1）；  END；  /   If this code were executed， which of the following statements would be true？（）

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You find that the database performance degrades while you backup the PROD database using Recovery Manager （RMAN）. The PROD database is running in shared server mode. The database instance is currently using 60% of total operating system memory. You suspect the shared pool fragmentation to be the reason. Which action would you consider to overcome the performance degradation？（）

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Consider the following: Which statement best describes the meaning of the value for the key_len column?（）

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