[单选]

You issue the following command：  
RMAN>CONFIGURE BACKUP OPTIMIZATION ON；  
What is the result of this command on your backups？（）

You define a multiple-row subquery in the WHERE clause of an SQL query with a comparison operator "=". What happens when the main query is executed? （） The main query executes with the first value returned by the subquery.。 The main query executes with the last value returned by the subquery.。 The main query executes with all the values returned by the subquery.。 The main query fails because the multiple-row subquery cannot be used with the comparison operator.。 You cannot define a multiple-row subquery in the WHERE clause of a SQL query.。 在国际税收关系中，优先适用（）管辖权已经成为各国公认的准则。 A、地域管辖权 。 B、属人管辖权 。 C、居民管辖权 。 D、公民管辖权。 A customer purchased a new IBM xSeries x445.  They already have a non-IBM industry standard rack with 14U of open space that is being considered to house the new server.  The rack houses an existing UPS unit for the entire rack.  Which of the following questions is most important to ensure that the power in the datacenter environment is ready for the initial install？（） Have optional Fibre Channel and Ethernet switches been installed in the server？。 What is the available kVA value of the UPS？。 Are there sufficient empty socket outlets in the UPS？。 What is the impact on the power consumption of the data center cooling system？。 拉底 能量蛋白比

You issue the following command：  
RMAN>CONFIGURE BACKUP OPTIMIZATION ON；  
What is the result of this command on your backups？（）