[单选]
Initially， for the Automatic Workload Repository （AWR） statistics， the retention period is set to 7 days， the collection interval is set to 30 minutes and the collection level is set to Typical in your production database.
You have been using the Memory Advisor for the last three months to generate recommendations for tuning memory components. However， when you observe the Memory Advisor on a Friday， you find that the statistics are available only for two days， Thursday and Friday， of that week.
What would have caused the statistics to be removed？（）

A . On Wednesday， the statistics have been purged.
B . On Wednesday， the retention period has been set to zero.
C . On Wednesday， the collection interval has been set to zero.
D . On Wednesday， the collection level has been changed to All.
E . On Wednesday， the retention period has been set to one day.
F . On Wednesday， the retention period has been set to two days.
G . On Wednesday， the collection level has been changed to Typical.
H . On Wednesday， the collection interval has been set to 1440 minutes.

在清算假设前提下要求评估资产的清算价格调整概算应与批复的初步设计概算逐项对比，并附有详细的造价增长原因分析。下列指标中，组成节能建筑工程评价指标体系的有（）。体感变化。建筑规划。运营管理。室内环境。建筑围护结构。 You perform a backup using the following BACKUP command： RMAN> BACKUP AS COMPRESSED BACKUPSET DATABASE； Which statement is true of this command？（） A different procedure is required to restore a database from compressed backups。 The AS COMPRESSED clause of the BACKUP command provided by RMAN is used to create compressed backup sets and image copies.。 Using this command to create backups minimizes the bandwidth consumed。 Using this command to create backups improves the performance of the backup proce。简述米尔格罗姆和罗伯茨模型。

Initially， for the Automatic Workload Repository （AWR） statistics， the retention period is set to 7 days， the collection interval is set to 30 minutes and the collection level is set to Typical in your production database.
You have been using the Memory Advisor for the last three months to generate recommendations for tuning memory components. However， when you observe the Memory Advisor on a Friday， you find that the statistics are available only for two days， Thursday and Friday， of that week.
What would have caused the statistics to be removed？（）

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