Whichbuilt-inreturnsaBOOLEANvaluethatindicatedwhetheranobjectsinternalIDisavailable？（）
A. GET_ID
B. ID_NULL
C. ID_FIND
D. FIND_ID
WhilecreatingajobclassusingtheDBMS_SCHEDULERpackage，yousettheloggingleveltoLOGGING_RUNS.Whatwouldbetheimpactofthissetting？（）
A. OracleSchedulerwouldwritedetailedinformationtothejoblogforeachrunofeachjobinthejobclass.
B. OracleSchedulerwouldwritedetailedinformationtothejoblogforthefirstrunofeachjobinthejobclass.
C. OracleSchedulerwouldwritedetailedinformationtothejoblogforeachrunofonlythefirstjobinthejobclass.
D. OracleSchedulerwouldwritedetailedinformationforalloperationsperformedonalljobsinthejobclass.
YouworkasadatabaseadministratorforCertkiller.com.Redologfilesarenotmultiplexedinyourdatabase.Redologblocksarecorruptedingroup2，andarchivinghasstopped.Alltheredologsarefilledanddatabaseactivityishalted.Databasewriterhaswritteneverythingtodisk.Whichcommandwouldyouexecutetoproceedfurther？（）
A. RECOVERLOFIELBLOCKGROUP2；
B. ALTERDATABASEDROPLOGFILEGROUP2；
C. ALTERDATABASECLEARLOGFILEGROUP2；
D. ALTERDATABASERECOVERLOGFILEGROUP2；
E. ALTERDATABASECLEARUNARCHIVEDLOGFILEGROUP2；
Twodatabaseusers，JackandBill，areaccessingtheCertkillerSTAFFtableoftheCertkillerDBdatabase.WhenJackmodifiesavalueinthetable，thenewvalueisinvisibletoBill.WhichisthemodifiedvalueinvisibletoBill？（）
A. Themodifieddataarenotavailableondisk.
B. Themodifieddatahavebeenflushedoutfrommemory.
C. ThemodifiedrowsoftheCertkillerSTAFFtablehavebeenlocked.
D. Jackhasnotcommittedthechangesaftermodifyingthevalue.
E. Bothusersareaccessingthedatabasefromtwodifferentmachines.
微信支付 
支付宝支付