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Your database is functional with peak load for one hour. You

题目
单选题
Your database is functional with peak load for one hour. You want to preserve the performance statistics collected during this period so that they can be used for comparison while analyzing the performance of the database in the future.  What action would you take to achieve this task？（）
A

Set the STATISTICS_LEVEL initialization parameter to ALL.

B

Create a baseline on a pair of snapshots that have the statistics of the peak­load period in the database.

C

Decrease the snapshot interval in the AWR to collect more number of snapshots during the peak­load period.

D

Set the snapshot retention period in the Automatic Workload Repository （AWR） to zero to avoid theautomatic purging of the snapshots.

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相似问题和答案

第1题：

共用题干
Energy Cycle
Do you find getting up in the morning so difficult that it's painful?This might be called laziness,but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy cycle.
During the hours when you labor through your work you may say that you're“hot”.That's true .The time of day when you feel most energetic is when your cycle of body temperature is at its peak .For some people the peak comes during the morning. For others it comes in the afternoon or evening.No one has discovered why this is so,but it leads to such familiar monologues as:“Get up,John!You'll be late for work again!”The possible explanation to the trouble is that John is at his temperature-and-energy peak in the evening. Much family quarrelling ends when husbands and wives realize what these energy cycles mean,and which cycle each member of the family has.
You can't change your energy cycle,but you can learn to make your life fit to it better. Habit can help,Dr. Kleitman believes. Maybe you're sleepy in the evening but you must stay up late anyway .Counteract your cycle to some extent by habitually staying up later than you want to. If your energy is low in the morning but you have an important job to do early in the day,rise before your usual hour. This won't change your cycle,but you'll get up steam and work better at your low point.
Get off to a slow start which saves your energy .Get up with a leisurely yawn and stretch.Sit on the edge of the bed a minute before putting your feet on the floor. Avoid the trouble of searching for clean clothes by laying them out the night before .Whenever possible,do routine work in the afternoon and save tasks requiring more energy or concentration for your sharper hours.

Which of the following statements is NOT TRUE?
A: Getting off to work with a minimum effort helps save one's energy.
B: Dr. Kleitman explains why people reach their peak at different hours of day.
C: Habit helps a person adapt to his own energy cycle.
D: Children have energy cycles,too.

答案：B
解析：
根据第一段可以看出，早晨起不来与个人每天的能量周期有关。根据文章第二段中约翰自言自语以及紧接着的解释“Get up , John ! You'll be late for work again ! ” The explanation… temperature-and-energy peak in the evening．可推断出答案。


答案的线索在第二段最后一句话“Much family quarrelling ends when husbands and wives realize what these energy cycles mean,and which cycle each member of the family has.”也就是说，如果丈夫和妻子能明白不同的能量周期是怎么回事，家里每个人有什么样的能量周期，很多家庭争吵就不会发生。所以正确答案是A。


“如果一个人想在早上能量低潮时更有效地工作，那么他该怎么办？”根据这两句话“If your energy is low in the morning but you have…but you'll get up steam and work better at your low point.”可以断定正确答案应该是C。


“建议你早上起床时打个呵欠，伸伸懒腰，因为它们会＿______”首先应理解文章最后一段的第一句话“get off to a slow start which saves your energy”，还要理解该句后面的三句话，它们是保存能量的具体方法。“Get up with a leisurely yawn and stretch”当然是为了保存能量。所以正确答案是A。


选项B说Dr. Kleitman解释了为什么人们在一天里的不同时刻会有不同的能量高峰。而文章第二段指出没有人发现为什么会有不同的能量周期“For some people the peak comes during morning…No one has discovered why this is so.”两者不符，所以正确答案是B。

第2题：

You work as a database administrator for Certkiller .com. Your database is functional. One of the disks containing a mirrored redo log member has bad sectors in it. You are unable to fix the damaged file.  How does the loss of a redo log member affect the instance of the database that is currently running？（）

  • A、The instance would normally abort.
  • B、The instance would not be affected.
  • C、The instance would be invalid， so would have to be aborted.
  • D、The instance would remain open， but the LGWR process would fail.
  • E、The instance would remain open and would automatically create the missing file

正确答案:B

第3题：

共用题干
Energy Cycle

Do you find getting up in the morning so difficult that it's painful?This might be called laziness, but Dr. Kleitman has a new explanation.He has proved that everyone has a daily energy cycle.
During the hours when you labor through your work you may say that you are"hot".That's true.The time of day when you feel most energetic is when your cycle of body temperature is at this peak.For some people the peak comes during the morning. For others it comes in the afternoon or evening. No one has discovered why this is so,but it leads to such familiar words as:"Get up, John!You'll be late for work again!"The possible explanation to the trouble is he is at his tempera-ture-and-energy peak in the evening. Much family quarrelling ends when husbands and wives realize what these energy cycles mean,and which cycle each member of the family has.
You can't change your energy cycle,but you can learn to make your life fit it better. Habit can help,Dr. Kleitman believes.Maybe you're sleepy in the evening but feel you must stay up late anyway.Counteract your cycle to some extent by habitually staying up later than you want to.If your energy is low in the morning but you have an important job to do early in the day,rise before your usual hour. This won't change your cycle,but you'll get up steam and work better at your low point.
Get off to a slow start,which saves your energy.Get up with a leisurely yawn and stretch.Sit on the edge of the bed a minute before putting your feet on the floor. Avoid the troublesome search for clean clothes by laying them out the night before.Whenever possible,do routine work in the afternoon and save tasks requiring more energy for your sharper hours.

If your energy peak is in the evening,you might like to get up late.
A:Right
B:Wrong
C:Not mentioned

答案：A
解析：
虽然文章第一段提到早上起不来床会被称为懒，但是本文强调的是Kleitman博士所提出的新观点，就是这可能是由于每个人不同的能量周期决定的。因此不是所有早上起不来的人都是懒，所以这句话是错误的。
根据文章第二段和第三段我们知道能量峰值在晚上的人早上精神会不好，能量峰值在早上的人则相反，因此本句是正确的。
文章第二段最后一句讲到如果夫妻双方都能意识到能量周期的不同，那么“much family quarrelling ends”，即少了许多争吵，也就是说很多争吵是因为没有意识到能量周期的问题，因此本句表述是错误的。
第二段三句讲“The time of day when you feel most energetic is when your cycle of body temperature is at this peak"，即精力最充沛的时候体温最高，但这并不意味着精力和体温是一码事，例如人生病的时候会发烧但精神会很差。本句的表述是错误的。
文章第二段告诉我们“No one has discovered why this is so”，即没人知道为什么每个人的能量周期不同，因此我们也不知道是不是有遗传因素，所以选择选项C。
第三段第一句告诉我们虽然可以让自己的生活适应能量周期，但是“you can't change your energy cycle"，因此本句表述是错误的，应当选择选项B。
文章第三段最后两句建议早上处于低潮的人们要比平时起得早，这样才能工作得更好。因此本句的陈述是正确的。

第4题：

Your production database is running in the ARCHIVELOG mode and the ARCn process is functional. You have two online redo log groups. Which three background processes would be involved when a log switch happens？ （）

  • A、archival
  • B、log writer
  • C、database writer
  • D、system monitor
  • E、process monitor
  • F、change tracking writer

正确答案:A,B,C

第5题：

Your archive-log destination directory runs out of space. What is the impact of this on the database？（）  

  • A、 None. The database will switch over to the stand-by archive-log destination directory.
  • B、 A warning message will be written to the alert log of the database，but no adverse impacts to the database will be experienced.
  • C、 The database will shut down，and will not restart until you correct the out-of-space situation.
  • D、 The database will continue to try to write to the archive-log destination directory for one hour. After one hour，the database will shut down normally.
  • E、 Once Oracle has cycled through all online redo logs，it will stop processing any DML or DDL until the out-of-space condition is corrected.

正确答案:E

第6题：

共用题干
Energy Cycle
Do you find getting up in the morning so difficult that it's painful?This might be called laziness,but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy cycle.
During the hours when you labor through your work you may say that you're“hot”.That's true .The time of day when you feel most energetic is when your cycle of body temperature is at its peak .For some people the peak comes during the morning. For others it comes in the afternoon or evening.No one has discovered why this is so,but it leads to such familiar monologues as:“Get up,John!You'll be late for work again!”The possible explanation to the trouble is that John is at his temperature-and-energy peak in the evening. Much family quarrelling ends when husbands and wives realize what these energy cycles mean,and which cycle each member of the family has.
You can't change your energy cycle,but you can learn to make your life fit to it better. Habit can help,Dr. Kleitman believes. Maybe you're sleepy in the evening but you must stay up late anyway .Counteract your cycle to some extent by habitually staying up later than you want to. If your energy is low in the morning but you have an important job to do early in the day,rise before your usual hour. This won't change your cycle,but you'll get up steam and work better at your low point.
Get off to a slow start which saves your energy .Get up with a leisurely yawn and stretch.Sit on the edge of the bed a minute before putting your feet on the floor. Avoid the trouble of searching for clean clothes by laying them out the night before .Whenever possible,do routine work in the afternoon and save tasks requiring more energy or concentration for your sharper hours.

If a person finds getting up early a problem,most probably______.
A: he is a lazy person
B: he refuses to follow his own cycle
C: he is not sure when his energy is low
D: he is at his peak in the afternoon or evening

答案：D
解析：
根据第一段可以看出，早晨起不来与个人每天的能量周期有关。根据文章第二段中约翰自言自语以及紧接着的解释“Get up , John ! You'll be late for work again ! ” The explanation… temperature-and-energy peak in the evening．可推断出答案。


答案的线索在第二段最后一句话“Much family quarrelling ends when husbands and wives realize what these energy cycles mean,and which cycle each member of the family has.”也就是说，如果丈夫和妻子能明白不同的能量周期是怎么回事，家里每个人有什么样的能量周期，很多家庭争吵就不会发生。所以正确答案是A。


“如果一个人想在早上能量低潮时更有效地工作，那么他该怎么办？”根据这两句话“If your energy is low in the morning but you have…but you'll get up steam and work better at your low point.”可以断定正确答案应该是C。


“建议你早上起床时打个呵欠，伸伸懒腰，因为它们会＿______”首先应理解文章最后一段的第一句话“get off to a slow start which saves your energy”，还要理解该句后面的三句话，它们是保存能量的具体方法。“Get up with a leisurely yawn and stretch”当然是为了保存能量。所以正确答案是A。


选项B说Dr. Kleitman解释了为什么人们在一天里的不同时刻会有不同的能量高峰。而文章第二段指出没有人发现为什么会有不同的能量周期“For some people the peak comes during morning…No one has discovered why this is so.”两者不符，所以正确答案是B。

第7题：

Your boss at Supportcenter.cn wants you to clarify Oracle 10g. Which condition in your database forces you to perform only consistent backups？（）

  • A、The database is in mount state.
  • B、One of the tablespaces is offline.
  • C、One of the tablespaces is read only.
  • D、The database operates in ARCHIEVELOG mode. 
  • E、The database operates in NOARCHIEVELOG mode.

正确答案:E

第8题：

共用题干
Energy Cycle

Do you find getting up in the morning so difficult that it's painful?This might be called laziness, but Dr. Kleitman has a new explanation.He has proved that everyone has a daily energy cycle.
During the hours when you labor through your work you may say that you are"hot".That's true.The time of day when you feel most energetic is when your cycle of body temperature is at this peak.For some people the peak comes during the morning. For others it comes in the afternoon or evening. No one has discovered why this is so,but it leads to such familiar words as:"Get up, John!You'll be late for work again!"The possible explanation to the trouble is he is at his tempera-ture-and-energy peak in the evening. Much family quarrelling ends when husbands and wives realize what these energy cycles mean,and which cycle each member of the family has.
You can't change your energy cycle,but you can learn to make your life fit it better. Habit can help,Dr. Kleitman believes.Maybe you're sleepy in the evening but feel you must stay up late anyway.Counteract your cycle to some extent by habitually staying up later than you want to.If your energy is low in the morning but you have an important job to do early in the day,rise before your usual hour. This won't change your cycle,but you'll get up steam and work better at your low point.
Get off to a slow start,which saves your energy.Get up with a leisurely yawn and stretch.Sit on the edge of the bed a minute before putting your feet on the floor. Avoid the troublesome search for clean clothes by laying them out the night before.Whenever possible,do routine work in the afternoon and save tasks requiring more energy for your sharper hours.

One can change his energy cycle once he make up his mind.
A:Right
B:Wrong
C:Not mentioned

答案：B
解析：
虽然文章第一段提到早上起不来床会被称为懒，但是本文强调的是Kleitman博士所提出的新观点，就是这可能是由于每个人不同的能量周期决定的。因此不是所有早上起不来的人都是懒，所以这句话是错误的。
根据文章第二段和第三段我们知道能量峰值在晚上的人早上精神会不好，能量峰值在早上的人则相反，因此本句是正确的。
文章第二段最后一句讲到如果夫妻双方都能意识到能量周期的不同，那么“much family quarrelling ends”，即少了许多争吵，也就是说很多争吵是因为没有意识到能量周期的问题，因此本句表述是错误的。
第二段三句讲“The time of day when you feel most energetic is when your cycle of body temperature is at this peak"，即精力最充沛的时候体温最高，但这并不意味着精力和体温是一码事，例如人生病的时候会发烧但精神会很差。本句的表述是错误的。
文章第二段告诉我们“No one has discovered why this is so”，即没人知道为什么每个人的能量周期不同，因此我们也不知道是不是有遗传因素，所以选择选项C。
第三段第一句告诉我们虽然可以让自己的生活适应能量周期，但是“you can't change your energy cycle"，因此本句表述是错误的，应当选择选项B。
文章第三段最后两句建议早上处于低潮的人们要比平时起得早，这样才能工作得更好。因此本句的陈述是正确的。

第9题：

You are using flat files as the data source for one of your data warehousing applications. To optimize the application performance， you plan to move the data from the flat files to clustered tables in an Oracle database.While migrating the data， you want to have minimal impact on the database performance and optimize the dataload operation.  Which method would you use to load data into the Oracle database（）

  • A、Use the external table population.
  • B、Use the Oracle Data Pump export and import utility.
  • C、Use the conventional path data load of the SQL*Loader utility.
  • D、Use the INSERT INTO...SELECT command to load the data

正确答案:C

第10题：

Your database is in ARCHIVELOG mode. You have two online redo log groups，each of which contains one redo member.  When you attempt to start the database， you receive the following errors：（）

  • A、 ALTER DATABASE DROP LOGFILE GROUP 1
  • B、 ALTER DATABASE CLEAR LOGFILE GROUP 1
  • C、 ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 1
  • D、 ALTER DATABASE DROP LOGFILE MEMBER ’D:///REDO01.LOG’

正确答案:C

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