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。
2
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.
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.