OMElement实现可以使用OM DataSource的实例按需提供数据，而OM Factory接口提供了创建这种类型的元素的方法。
An OMElement implementation can use an instance of OMDataSource to supply data on demand, and the OMFactory interface provides a method to create this type of element.
数据库分片提供许多优势，比如对数据库的更快读写、改进的搜索响应、更小的表格尺寸以及对表格的按需分配。
Database sharding provides many advantages, such as faster reads and writes to the database, improved search response, smaller table sizes, and distribution of tables based on need.
系统应该提供相应的机制，以便使用自行管理环境中的用户数据对用户进行身份验证，并使用按需环境中的访问控制数据进行授权。
The system should provide mechanisms to authenticate users with user data residing in the on-premise environment, and authorize with access control data residing in an on-demand environment.
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