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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。
考题
系统可靠性的简单度量是平均故障间隔时间(MTBF)，其计算公式是(9)。(MTTF: Mean Time To Failure; MTTR: Mean Time To Repair)A．MTTF+MTTRB．MTTF-MTTRC．MTTR-MTTFD．MTTF×MTTR
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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
考题
系统可靠性的简单度量是平均故障间隔时间(MTBF)，其计算公式是(23)；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(24)。(MTTF： Mean Time To Failure：MTTR：Mean Time To Repair)A．MTTF+MTTRB．MTTF-MTTRC．MTTR-MTTFD．MTTF×MTTR
考题
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．
考题
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(11)。(MTTF：Mean Time To Failure；MTTR：Mean Time To Repair)A．可用性=×100%B．可用性=×100%C．可用性=×100%D．可用性=×100%
考题
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．错误B．正确
考题
A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?A.The motion of the apparent sun is along the eclipticB.Measurement of time is along the celestial equatorC.The speed of the Earth's revolution is not constantD.There are variations in the Earth's rotational speed
考题
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
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
考题
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
Which two statements are true about setting the FAST_START_MTTR_TARGET initialization parameter to anonzero value（）A、The MTTR advisor will be disabled.B、Automatic checkpoint tuning will be enabled.C、The value for the LOG_CHECKPOINT_INTERVAL initialization parameter will be override the value forFAST_START_MTTR_TARGET.D、The time taken to recover the instance after the crash is always exactly the same as the value given for theinitialization parameter.
考题
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
考题
What are the two advantages of RMAN Block Media Recovery （BMR） over file/x7flevel recovery？（）A、BMR lowers the mean time to recover （MTTR）.B、BMR supports pointintime recovery of individual data blocks.C、BMR enables you to use incremental backups for block recovery.D、BMR enables recovery even when the database is not mounted or open.E、BMR enables you to use proxy backups to perform block media recovery.F、BMR enables increased availability of data during recovery because the data file that requires a recovery can remain online.
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.
考题
多选题What are the two advantages of RMAN Block Media Recovery （BMR） over file-level recovery？（）ABMR lowers the mean time to recover （MTTR）.BBMR supports point-in-time recovery of individual data blocks.CBMR enables you to use incremental backups for block recovery.DBMR enables recovery even when the database is not mounted or open.EBMR enables you to use proxy backups to perform block media recovery.FBMR enables increased availability of data during recovery because the data file requires a recovery can remain online.
考题
多选题Which two statements are true about setting the FAST_START_MTTR_TARGET initialization parameter to anonzero value（）AThe MTTR advisor will be disabled.BAutomatic checkpoint tuning will be enabled.CThe value for the LOG_CHECKPOINT_INTERVAL initialization parameter will be override the value forFAST_START_MTTR_TARGET.DThe time taken to recover the instance after the crash is always exactly the same as the value given for theinitialization parameter.
考题
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
考题
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A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）A
The motion of the apparent sun is along the eclipticB
Measurement of time is along the celestial equatorC
The speed of the Earth's revolution is not constantD
There are variations in the Earth's rotational speed
考题
单选题The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.A
An atomic time standardB
Daylight Savings TimeC
Eastern Standard TimeD
Greenwich Mean Time
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
多选题Which two statements are true about setting the FAST_START_MTTR_TARGET initializationparameter to a nonzero value（）AThe MTTR advisor will be disabled.BAutomatic checkpoint tuning will be enabled.CThe value for the LOG_CHECKPOINT_INTERVAL initialization parameter will be override the value forFAST_START_MTTR_TARGET.DThe time taken to recover the instance after the crash is always exactly the same as the value given forthe FAST_START_MTTR_TARGET initialization parameter.
考题
填空题MTTR（Mean Time To Repair）：（）。
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