题目内容

A distributed database can be classified either as a [填空1] distributed database or as a [填空2] distributed database. Of the two databases, [填空3] is more secure than the other one.

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There are three levels in the DBMS architecture. Among them, [填空1] level is to interact with users directly, [填空2] level is to interact with hardware directly, and query is on [填空3] level.

Before the emergence of databases, what was the traditional way of data storage?

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