When a program writes to memory, the processor only modifies the line in the cache, but does not update main memory.
当一个程序写入存储，处理器仅仅只会修改缓存线，而不会更新主要的存储内容。
The method includes the steps of taking a before-image of the primary database in main memory before an update to the primary database;
该方法包括以下步骤：在对数据库进行更新之前取得主存储器中的主要数据库的前映象；
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