For example, imagine that you have an application that must iterate through a very large number of rows in a database.
例如，假设您有一个应用程序，它必须遍历数据库中大量行。
But if your relational databases contain millions of records, you could have a very large and potentially very slow Notes database.
但是如果关系数据库包含数百万条记录，相应的Notes数据库就可能变得非常大并且可能会非常慢。
As you can imagine, this could become a very expensive operation if the database is large.
正如您想象的那样，如果数据库比较大的话，这可能是一项成本高昂的操作。
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