The energy required for thi exchange i manageable when the tak i mall—a proceor need to fetch le data from memory.

当处理任务只需要从存储器中提取少量数据的时候，这种数据交换所需的能量是可以管理。

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The fetch relationship between the entities Trade and TradeDetails is set to Lazy, which helps your performance and memory footprint, as you will see in the next section.

实体Trade和TradeDetails之间的提取关系被设置为Lazy，正如在下一节中会看到的，这有助于改进性能和内存占用量。

youdao

For an XML data source, each time you need data from the XML, VVM has to fetch the XML from its source, load it in memory, parse it, and then transform it into relational format.

对于XML数据源，每次需要XML数据时，VVM需要从源获取数据，加载到内存中，解析，然后转换成关系格式。

youdao

Rather than memories that have to go to a specific address and step and fetch it, they can address databases in memory through similar content methods.

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