フリー問題

問題文

A weekly report shows the buffer cache hit ratio at ninety four percent and the team wants to raise it to ninety nine. How should that number be treated?

選択肢

1. As a threshold that has to be registered with the alert mechanism so that a warning is raised whenever the value falls below the level that was chosen.
2. As a rate that has to be converted into a share of database time before it can be compared with the other entries.
3. As a target that has to be met before the workload can be considered healthy because a value below the target always means the cache is too small.
4. As an indicator that has to be checked against the other performance data before any conclusion about a bottleneck is drawn from it.