It can also facilitate users to define and manipulate data, maintain the security and integrity of data, and the concurrency control and database recovery under multi-user circumstances.

它使用户能方便地进行定义和操纵数据，维护数据的安全性和完整性，以及多用户下的并发控制和恢复数据库等操作。

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It can also facilitate users to define and manipulate data, maintain the security and integrity of data, and the concurrency control and database recovery under multi-user circumstances.

它使用户能方便地进行定义和操纵数据，维护数据的安全性和完整性，以及多用户下的并发控制和恢复数据库等操作。

youdao