You executed the following command in Recovery Manager （RMAN） against your Oracle 10g database：RMAN> REPORT NEED BACKUP days 3；What would be the output of this command？（） a list of files that require a backup within three days。 a list of files that have not been backed up for three days。 a list of files that RMAN recommends be backed up only once in every three days， based on low volatility。 a list of files for which a backup has already been performed and may need a backup after three day。
根据施蒂格勒1957年发表的《地方政府职能的有理范围》，为了实现资源配置的有效和收入分配的公平，决策应在（）行政水平的政府部门进行。 较低。 较高。 中等。 最高。
In a recent Automatic Workload Repository (AWR) report for your database, you notice a high number of buffer busy waits. The database consists of locally managed tablespaces with free list managed segments. On further investigation, you find that buffer busy waits is caused by contention on data blocks. Which option would you consider first to decrease the wait event immediately?（） Decreasing PCTUSED。 Decreasing PCTFREE。 Increasing the number of DBWN process。 Using Automatic Segment Space Management (ASSM)。 Increasing db_buffer_cache based on the V$DB_CACHE_ADVICE recommendatio。
Which two statements are true about the Automatic Workload Repository （AWR）（） All AWR tables belong to the SYSTEM schema.。 The AWR contains systemwide tracing and logging information.。 The snapshots collected by the AWR are accessible through data dictionary views.。 The snapshots collected by the AWR are used by self-tuning components in the database.。
在进行变压器的空载试验和负载试验时，若试验频率偏差较大，则下列参数中与频率无关的是（）。 空载损耗。 空载电流。 绕组的电阻损耗。 绕组的涡流损耗。 由漏磁通引起的构件涡流损耗。 阻抗电压的有功分量。 阻抗电压的无功分量。
西周分封制和井田制的纽带是（）。
