WhichthreetaskscanbeperformedusingregularexpressionsupportinOracleDatabase10g？（）
A. itcanbeusedtoconcatenatetwostrings.
B. itcanbeusedtofindoutthetotallengthofthestring.
C. itcanbeusedforstringmanipulationandsearchingoperations.
D. itcanbeusedtoformattheoutputforacolumnorexpressionhavingstringdata.
E. itcanbeusedtofindandreplaceoperationsforacolumnorexpressionhavingstringdata.
Examinethisstatement：RMAN＞BACKUPFORMAT’/BACKUP/df_%d_%s_%p.bus1DATABASEfilesperset=2；WhatstatemustthetargetdatabasebeinforyoutousethisRMANcommand？（）
A. Thetargetdatabasemustbeopen.
B. Thetargetdatabasemustbeclosed.
C. Thetargetdatabasemustbemounted.
D. Thetargetdatabasemustbemountedoropen.
Whichfilesmustbesynchronizedinorderforadatabasetostart？（）
A. tempfiles
B. onlinedatafiles
C. offlinedatafiles
D. readonlydatafiles
YouneedtoimportalldefinitionsofobjectsbelongingtotheTS_EMPLOYEEStablespacebyusingtheexportfileexpdat.dmp.Whichimportstatementiscorrect？（）
A. imphr/hrTABLES=（ts_employees）rows=y
B. impsystem/managerFROMUSER=hrfile=expdat.dmp
C. imphr/hrTRANSPORT_TABLESPACE=yfile=expdat.dmp
D. impsystem/managerTRANSPORT_TABLESPACE=yTABLESPACE=ts_employees
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