フリー問題

問題文

During a morning review an engineer wants one screen that shows whether the host is short of resources and which statements are consuming the time. What has to be on that screen?

選択肢

1. The aggregated query metrics on their own because the time that statements spend already contains the effect of a shortage of resources.
2. The counters of the host together with the aggregated query metrics because either half taken on its own hides a whole class of problems.
3. The counters of the host on their own because a shortage of resources is what makes the statements slow and the query side follows from that.
4. The list of recommendations on its own because the entries raised for the host already summarize both the resources and the statements as a whole.