[单选]

A storage specialist is explaining to the customer that relational databases need an additional point-in-time copy process to assure data in memory buffers are flushed to disk prior to the hardware based snapshot command being executed. 
Which IBM software solution provides usable and consistent point-in-time data copies（）

You have enabled backup optimization for the RMAN environment.Identify two criteria on which RMAN will skip the file, if it has already been backed up.（） The data file backup is done with multiple channels。 The data files is in the read-write mode after being backed up in the read only mode。 The backup was taken after the data files was taken offline-normal or is in the read only mode。 The data file backup complies with the back retention policy and the backup duplexing feature。 土壤容重 IBM XIV采用的体系架构是（） 总线架构。 网格架构。 交换机架构。 三层架构。 餐饮实物不仅可以满足宾客最基本的（），还可以从其色、香、味、形、（）、（）、（）上使宾客得到感官上的享受。 心理学家研究发现，以下（）因素经常影响群体的形成。 编制。 个人目标。 共同兴趣。 群体的工具作用。

A storage specialist is explaining to the customer that relational databases need an additional point-in-time copy process to assure data in memory buffers are flushed to disk prior to the hardware based snapshot command being executed. 
Which IBM software solution provides usable and consistent point-in-time data copies（）