The primary use of virtual mode, however, is to optimize performance when interacting with large amounts of data.
不过虚拟模式的主要用途，是在与大量资料互动时最佳化效能。
When you are implementing virtual mode, you will need to track when a new row is needed in the data model and when to rollback the addition of the new row.
在实现虚拟模式时，您需要跟踪数据模型中何时需要新行，以及何时回滚新行的添加操作。
When you are implementing virtual mode, you will need to track when a new row is needed in the data model and when to rollback the addition of the new row.
在实现虚拟模式时，您需要跟踪数据模型中何时需要新行，以及何时回滚新行的添加操作。
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