题目内容

You work as a database administrator for Certkiller .com. In your transaction application， you have scheduled a job to update the optimizer statistics at05：00 pm every Friday. The job has successfully completed. Which three pieces of information would you check to confirm that the statistics have been collected？（）

Average row size
B. Last analyzed date
C. Size of table in bytes
D. Size of table in database blocks
E. Number of free blocks in the free list
F. Number of extents present in the table.

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A. 患病率是指某特定时间内的总人口中，患有某病（某病新旧病例）者所占的比例
B. 患病率与发病率和病程无关
C. 患病率是指在特定时间内一定人群中，某病所有病例数所占的比例
D. 患病率对病程短的一些急性传染性疾病的流行状况能提供有价值的信息

A. 正确
B. 错误