在为业务繁忙的企业的多个部门服务的数据库系统中，同时开展各部门的OLTP业务和数据分析业务会给数据库系统带来性能冲突，下列方案中无法从根本上解决性能冲突的是（）。
A．抽取出各部门需要的分析数据，建立各部门独立的数据集市，将数据分析业务转移到数据集市中
B．抽取出企业所有分析功能所需的分析数据，建立统一的企业级数据仓库环境，将企业的大部分分析业务转移到数据仓库环境中
C．抽取出企业的近期业务数据，建立操作型数据存储(ODS)，将一些快速分析业务转移到操作型数据存储中
D．不建立新的数据存储体系，在基本业务处理时间内开展OLTP业务，在其余时间开展分析业务
参考答案：D
解析：
解决企业联机事务处理业务和数据分析业务之间的性能冲突问题，根本的解决途径是从联机事务处理环境中抽取数据，建立新的数据分析环境，即建立操作型数据存储，将分析业务转移到操作性数据存储中。
Fifty–eight percent of the teachers interviewed in the Association of Teachers and Lecturers (ATL) questionnaire had come across copying among their pupils. Gill Bullen from Itchen College in Southampton, for example, said, "Pieces handed in by two students were identical and significantly better than either of them could have done. Not only that, the essays handed in didn't quite answer the title question I had set". A teacher from Leeds said, "I had one piece of work so bravely cut and pasted that it still contained ads from the web page." Connie Robinson from Stockton Riverside College said, "With less able students it is easy to spot copying as the writing style changes in the middle of the assignment, but with more able students it is sometimes necessary for tutors to carry out Internet research to identify the source of the copy." Mary Bousted, general secretary of the ATL, said," Teachers are struggling under a mountain of cut-and-pasting to spot whether work was the student's own or copy." She called for policies to stop copying, and asked for help from exam boards and the government in providing resources and techniques to detect cheats. But there was another side. "I have found once students clearly understand what copying is, its consequences and how to reference correctly so they can draw on published works, copying becomes less of a problem," said Diana Baker from Emmanuel College, Durham. "I think the majority of students who engage in copying do it more out of ignorance than the desire to cheat. They really want to succeed on their own." 53. The passage mainly wants to tell us ____________.
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