[单选]
You work as a database administrator at Certkiller .com. Your database is open and running in ARCHIVELOGmode. You take RMANfull backups every Sunday night. On Monday morning， while querying the user1.employeestable， 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？（）

A . flash back the corrupted blocks
B . use the DBMS_REPAIR package
C . use the RMAN TSPITR command
D . use the RMAN BLOCKRECOVER command
E . use the RESTORE DATABASE and RECOVER DATABASE commands
F . investigate the time at which the corruption occurred and perform a point-in-time recovery

用市场法评估无形资产应当注意哪些问题？ You are working on a test database where instance recovery takes a considerable amount of time.How can reduce the recovery time？（） By multiplexing the control files。 By multiplexing the redo log files。 By decreasing the size of redo log files。 By configuring mean time to recover （MTTR） to a lower value。 By setting the UNDO_RETENTION parameter to a higher value。地基验槽重点观察的内容有（）。基坑周边是否设置排水沟。地质情况是否与勘察报告相符。是否有旧建筑基础。基槽开挖方法是否先进合理。是否有浅埋坑穴、古井。在安装机械密封过程中，不允许用工具（）密封元件以防止密封件被损坏。接触。敲打。运送。安装。耐力训练一般为中等强度，即（）最大摄氧量或（）最大心率，每次运动（）分钟左右，每周训练（）以上。

You work as a database administrator at Certkiller .com. Your database is open and running in ARCHIVELOGmode. You take RMANfull backups every Sunday night. On Monday morning， while querying the user1.employeestable， 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？（）

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