探讨了有关信用卡数据集市建设的问题。
Research the problem of the credit card data mart establishment.
用于永久或临时存储信用卡数据的数据库系统是什么？
Which database systems are used for either permanent or temporary storage of credit card data.
比如，RFID不能用于信用卡，因为信用卡数据可以在一段距离之外被读取，因而存在安全隐患。
For example, RFID cannot be used for credit CARDS, because the data can be read at a distance and so isn't secure enough.
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