多项选择题
A.You must ensure that the SALES database is mounted or open.
B.You must restore a backup control file to perform a block media recovery.
C.You must take the tools01.dbf data file offline before you start a block media recovery.
D.You must put the database in NOARCHIVELOG mode to perform a block media recovery.
E.You can perform only a complete media recovery of individual blocks； point-in-time recovery of individual data blocks is not supported.
单项选择题 Your database is open and running in ARCHIVELOG mode. You take RMAN full backups every Sunday night. On Monday morning， while querying the user1.employees table， you receive the following error message： 01578： ORACLE data block corrupted （file # 5， block # 51） ORA-01110： data file 5： ’/u01/app/oracle/oradata/orcl/example01.dbf’ You need to rectify the corruption while ensuring the following： The data file should remain online. The mean time to recover （MTTR） should be minimal. You are not using a backup control file， and all the archived logs are accessible. Which option would you choose？（）
单项选择题 TheDB_BLOCK_CHECKINGinitializationparameterissettoTRUE.Whatwouldbetheresultofthissettingonthedatablocksbeingwrittentothedatafiles，everytimetheDBWnwrites？（）
单项选择题 TheEMPLOYEEStableisstoredintheUSERStablespace.YouneedtocheckiftheEMPLOYEEStableisaffectedbytheblockcorruptionfoundintheUSERStablespace.Whichoptionwouldyouuse？（）