Data persistence services: These services perform data activities that are traditionally relegated to the database management system, such as create, read, update and delete.
数据保存服务：这些服务执行传统地归属于数据库管理系统的数据活动，例如创建、读取、更新和删除。
Modules are available for database connectivity, network programming, operating system services, and hundreds of other useful areas.
其中提供了各种各样的模块，可用于数据库连接、网络编程、操作系统服务和许多其他有价值的领域。
The dependency between the system services and the database server makes for difficulties in the following ways.
系统服务和数据库服务器之间的依赖性造成了以下方面的困难。
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