【数据库系统工程师202105】【5】一个栈的输入序列为1,2,3,4,5，不可能得到的输出序列是（5）。

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【数据库系统工程师202105】【4】若磁盘的转速提高一倍，则（4）。

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【数据库系统工程师202105】【3】采用DMA方式传送数据时，每传送一个数据都需要占用一个（3）。

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【数据库系统工程师202105】【2】以下关于RISC和CISC计算机的叙述中，正确的是（2）。

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【数据库系统工程师202105】【1】在CPU中，用（1） 给出将要执行的下一条指令在内存中的地址。

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【数据库系统工程师202011】【71-75】A database system is a collection of itererelated data and a set of programs that allow users to access and modify these data. A major purpose of a database system is to provide users with an（71）view of the data. That is, the system hides certain details of how the data are stored and maintained. For the system to be usable, it must retrieve data（72）. The need for efficiency has led designers to use complex data（73）to represent data in the database. Since many database-system users are not computer trained, developers hide the complexity from users through several levels of abstraction, to simplify users' interactions with the system. Physical level is the lowest level of abstraction that describes（74）the data are actually stored. Logical level is the next-higher level of abstraction that describes（75）data are stored in the database, and what relationships exist among those data. View level is the highest level of abstraction that describes only part of the entire database.

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【数据库系统工程师202011】【71-75】A database system is a collection of itererelated data and a set of programs that allow users to access and modify these data. A major purpose of a database system is to provide users with an（71）view of the data. That is, the system hides certain details of how the data are stored and maintained. For the system to be usable, it must retrieve data（72）. The need for efficiency has led designers to use complex data（73）to represent data in the database. Since many database-system users are not computer trained, developers hide the complexity from users through several levels of abstraction, to simplify users' interactions with the system. Physical level is the lowest level of abstraction that describes（74）the data are actually stored. Logical level is the next-higher level of abstraction that describes（75）data are stored in the database, and what relationships exist among those data. View level is the highest level of abstraction that describes only part of the entire database.

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【数据库系统工程师202011】【71-75】A database system is a collection of itererelated data and a set of programs that allow users to access and modify these data. A major purpose of a database system is to provide users with an（71）view of the data. That is, the system hides certain details of how the data are stored and maintained. For the system to be usable, it must retrieve data（72）. The need for efficiency has led designers to use complex data（73）to represent data in the database. Since many database-system users are not computer trained, developers hide the complexity from users through several levels of abstraction, to simplify users' interactions with the system. Physical level is the lowest level of abstraction that describes（74）the data are actually stored. Logical level is the next-higher level of abstraction that describes（75）data are stored in the database, and what relationships exist among those data. View level is the highest level of abstraction that describes only part of the entire database.

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【数据库系统工程师202011】【71-75】A database system is a collection of itererelated data and a set of programs that allow users to access and modify these data. A major purpose of a database system is to provide users with an（71）view of the data. That is, the system hides certain details of how the data are stored and maintained. For the system to be usable, it must retrieve data（72）. The need for efficiency has led designers to use complex data（73）to represent data in the database. Since many database-system users are not computer trained, developers hide the complexity from users through several levels of abstraction, to simplify users' interactions with the system. Physical level is the lowest level of abstraction that describes（74）the data are actually stored. Logical level is the next-higher level of abstraction that describes（75）data are stored in the database, and what relationships exist among those data. View level is the highest level of abstraction that describes only part of the entire database.

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【数据库系统工程师202011】【71-75】A database system is a collection of itererelated data and a set of programs that allow users to access and modify these data. A major purpose of a database system is to provide users with an（71）view of the data. That is, the system hides certain details of how the data are stored and maintained. For the system to be usable, it must retrieve data（72）. The need for efficiency has led designers to use complex data（73）to represent data in the database. Since many database-system users are not computer trained, developers hide the complexity from users through several levels of abstraction, to simplify users' interactions with the system. Physical level is the lowest level of abstraction that describes（74）the data are actually stored. Logical level is the next-higher level of abstraction that describes（75）data are stored in the database, and what relationships exist among those data. View level is the highest level of abstraction that describes only part of the entire database.

真题详情及解析