問題文
A report of a slow system lists the statistics that stand out and the team is about to act upon the largest of them. Which statement about reading a list of that kind is correct?
選択肢
- A statistic that stands out names the cause rather than the sign, so a contention that looks like a matter for the settings of the instance is usually put right by a change to those settings once the figures have been read.
- A statistic that stands out names the sign rather than the cause only when the figures come from the operating system, so a figure that the database itself reports can be acted upon as the cause without any further checking.
- A statistic that stands out often names the sign rather than the cause, so a contention that looks like a matter for the settings of the instance is usually put right by a change to the application that provokes it.
- A statistic that stands out often names the sign rather than the cause, so the largest of them has to be set aside and the second largest acted upon, because the largest is the one that the sampling is most likely to have distorted.