You scheduled a backup by using the Schedule Backup option in Oracle Enterprise Manager. Which statement about the script created by Oracle Enterprise Manager is true？ （）

单项选择题TheST_INFOmastertablehasmillionsofrowsthatareupdatedveryrarely.IthasaSTATE_CODEcolumnthatcontainsthevaluefor25states.ThetableisfrequentlyqueriedontheSTATE_CODEcolumn.Whichtypeofindexwouldyousuggesttoimprovethequeryperformance？（）

A.B-tree
B.bitmap
C.reverse key
D.function based

单项选择题Your alert log file has the following information： Tue May 25 17：43： 38 2004  ORA-00060： Deadlock detected. More info in file  u01 app oracle admin ORCL udump orcl_ora_3173.trc.  What would you do to ensure that database is still running correctly？（）

A.examine the trace file and kill the session that caused the deadlock
B.examine the trace file and kill both the sessions responsible for the deadlock
C.examine the trace file for details and ask the user who caused the deadlock to rollback the transaction
D.examine the trace file for details and remember that deadlocks are resolved automatically by Oracle database
E.examine the trace file for details and use the Undo Advisor to rollback the transaction that caused the deadlock

单项选择题Youspecifiedsegmentspacemanagementasautomaticforatablespace.Whateffectwouldthishaveonspacemanagement？（）

A.Extents would be managed by the freelists.
B.The segment would be managed by bitmaps.
C.The segment would be managed by the freelists.
D.Free space would be managed by the data dictionary.

单项选择题The user SCOTT executes the following command successfully to increase the salary values in one of his sessions：  SQL> UPDATE emp SET sal=sal*1.15 WHERE deptno=20；  Before SCOTT ends the transaction， user HR who has the privileges on EMP table executes a query to fetch the salary details but finds the old salary values instead of the increased values. Why does HR still see the old data？（）

A.because of redo data from redo log file
B.because of data from database buffer cache
C.because of data from a temporary tablespace
D.because of undo data from the undo tablespace

单项选择题Your database is started by using the server parameter file （SPFILE）. You issued this command to change the value of the LOG_BUFFER initialization parameter：  ALTER SYSTEM SET LOG_BUFFER=24M SCOPE=BOTH；  What would be the outcome of this command？ （）

A.The command would return an error because LOG_BUFFER is a static parameter.
B.The parameter value would be changed and it would come into effect immediately.
C.You need to restart the database so that parameter changes can come into effect.
D.The command would succeed only if initialization parameter LOG_ARCHIVE_MAX_PROCESS is set to value 2.