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MTTR（Mean Time To Repair）：（）。
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D) 【解析】系统的可靠性通常用平均无故障时间( MTBF)和平均故障修复时间( MTTR)来表示，MTTR是Mean Time To Repair的缩写，指修复一次故障所需要的时间。
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计算机的“可用性”主要取决于MTBF(Mean Time Between Failure)和MTTR(Mean Time To Repair)，一台计算机的可用性比较高是指A．MTBF和MTTR都高B．MTBF和MTTR都低C．MTBF高，MTTR低D．MTBF低，MTTR高
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软件可用性是指在某个给定时间点上程序能够按照需求执行的概率，其定义为(4)。(MTTF: Mean Time To Failure; MTTR: Mean Time To Repair)A．B．C．D．
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通常使用平均修复时间MTTR(Mean Time to Repair)和平均故障间隔时间MTBF(Mean Time Between Failure)这两个指标来评价产品或系统的可靠性。
A．错误B．正确
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评估流量时,令牌桶的参数设置主要包括()。
A.平均速率（Committed Information Rate）B.承诺突发尺寸（Committed Burst Size）C.超出突发尺寸EBS（Excess Burst Size）D.平均恢复时间MTTR（Mean Timeto Repair）
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The maximum difference between mean time and apparent time is ______.A.equal to the longitude expressed in time unitsB.about 16 minutesC.the difference between the GHA of mean sun and the first point of AriesD.15°of arc
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A signal indicating Greenwich mean time would be preceded with ______.A.a code hoist to indicate Greenwich mean time to followB.the letter GC.the letters GTD.the letter Z
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评估流量时，令牌桶的参数设置主要包括（）。A、平均速率（Committed Information Rate）B、承诺突发尺寸（Committed Burst Size）C、超出突发尺寸EBS（Excess Burst Size）D、平均恢复时间MTTR（Mean Timeto Repair）
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You are working on the 24X7 database with high transaction volume， to ensure faster instance recovery on your database you set the FAST_START_MTTR_TARGET initialization parameter to a very low value. What effect it will have on the database？（）A、The database performance would be enhanced.B、The redo log files would be get filled more frequently.C、The overall database performance would be degraded.D、The mean time to recover （MTTR） would be increased.
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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 blocksB、 use the DBMS_REPAIR packageC、 use the RMAN TSPITR commandD、 use the RMAN BLOCKRECOVER commandE、 use the RESTORE DATABASE and RECOVER DATABASE commandsF、 investigate the time at which the corruption occurred and perform a point-in-time recovery
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You are working on a test database where instance recovery takes a considerable amount of time.How can reduce the recovery time？（）A、By multiplexing the control filesB、By multiplexing the redo log filesC、By decreasing the size of redo log filesD、By configuring mean time to recover （MTTR） to a lower valueE、By setting the UNDO_RETENTION parameter to a higher value
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You issue the following statement： SQL SELECT FIRSTNAME， LASTNAME FROM HR.EMPLOYEE； You receive the following error： 01578： ORACLE data block corrupted （file# 6， block # 54） ORA-01110 ： data file 6： ’u01/oracle/oradata/data1.dbf’ How will you resolve this problem of data block corruption by reducing the mean time to recover （MTTR）？（）A、 by using the DBMS_REPAIR packageB、 by using the DBVERIFY utilityC、 by using Block Media RecoveryD、 by issuing the ANALYZE TABLE HR.EMPLOYEES VALIDATE STRUCTURE command
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多选题评估流量时，令牌桶的参数设置主要包括（）。A平均速率（Committed Information Rate）B承诺突发尺寸（Committed Burst Size）C超出突发尺寸EBS（Excess Burst Size）D平均恢复时间MTTR（Mean Timeto Repair）
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单选题You issue the following statement： SQL SELECT FIRSTNAME， LASTNAME FROM HR.EMPLOYEE； You receive the following error： 01578： ORACLE data block corrupted （file# 6， block # 54） ORA-01110 ： data file 6： ’u01/oracle/oradata/data1.dbf’ How will you resolve this problem of data block corruption by reducing the mean time to recover （MTTR）？（）A
by using the DBMS_REPAIR packageB
by using the DBVERIFY utilityC
by using Block Media RecoveryD
by issuing the ANALYZE TABLE HR.EMPLOYEES VALIDATE STRUCTURE command
考题
单选题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/x7f01110： 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 blocksB
use the DBMS_REPAIR packageC
use the RMAN TSPITR commandD
use the RMAN BLOCKRECOVER commandE
use the RESTORE DATABASE and RECOVER DATABASE commandsF
investigate the time at which the corruption occurred and perform a pointintime recovery
考题
单选题The maximum difference between mean time and apparent time is （）.A
equal to the longitude expressed in time unitsB
about 16 minutesC
the difference between the GHA of mean sun and the first point of AriesD
15°of arc
考题
多选题Which two statements are true about Block Media Recovery （BMR）？（）ABMR increases the Mean Time To Recover （MTTR）.BBMR can only be implemented using Recovery Manager （RMAN）.CThe blocks that need to be recovered are accessible during BMR.DBMR cannot be performed using cumulative incremental backups.EThe datafile must be restored if most of the blocks in the datafile are corrupt.
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判断题通常使用平均修复时间MTTR（Mean Time to Repair）和平均故障间隔时间MTBF（Mean Time Between Failure）这两个指标来评价产品或系统的可靠性。A
对B
错
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多选题You are working on a test database where instance recovery takes a considerable amount of time. How can reduce the recovery time？（）ABy multiplexing the control filesBBy multiplexing the redo log filesCBy decreasing the size of redo log filesDBy configuring mean time to recover （MTTR） to a lower valueEBy setting the UNDO_RETENTION parameter to a higher value
考题
单选题You are working on the 24X7 database with high transaction volume， to ensure faster instance recovery on your database you set the FAST_START_MTTR_TARGET initialization parameter to a very low value. What effect it will have on the database？（）A
The database performance would be enhanced.B
The redo log files would be get filled more frequently.C
The overall database performance would be degraded.D
The mean time to recover （MTTR） would be increased.
考题
判断题统可靠性是指该系统在服务时间内可靠工作的程度，常用平均修复时间（Mean Time To Repair，MTYR）来衡量。A
对B
错
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