TheDB_BLOCK_CHECKINGinitializationparameterissettoTRUE.Whatwouldbetheresultofthissettingonthedatablocksbeingwrittentothedatafiles，everytimetheDBWnwrites？（）
A. TheOracledatabasewillcheckalldatablocksbygoingthroughthedataoneachblock，makingsurethedataisself-consistent.
B. TheDBWnandthedirectloaderwillcalculateachecksumandstoreitinthecacheheaderofeverydatablockwhenwritingittodisk.
C. TheOracledatabasewillcheckdatablocksbelongingtotheSYSTEMtablespaceonly，bygoingthroughthedataoneachblock，makingsurethedataisself-consistent.
D. TheOracledatabasewillcheckdatablocksbelongingtotheSYSAUXtablespaceonly，bygoingthroughthedataoneachblock，makingsurethedataisself-consistent.
E. TheOracledatabasewillcheckdatablocksintheSYSTEMandSYSAUXtablespacesonly，bygoingthroughthedataoneachblock，makingsurethedataisself-consistent.
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可持续发展战略的根本目的是实现（）
A. 生态可持续发展
B. 经济可持续发展
C. 社会可持续发展
D. 环境可持续发展
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；
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