而另一方面，客户可能在主存储中有一些重复的数据库，但却不会太多。

In primary storage, on the other hand, your customer may have some duplicate databases but not much else.

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然而，对于简单网格，仍然需要数据库作为主存储。

For simple grids, however, a database is still required for primary storage.

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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；

The method includes the steps of taking a before-image of the primary database in main memory before an update to the primary database;

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