Our alphabet collection is a bad example as all the data is unique, so let's add a couple of records to the colors collection we created earlier in this article (see Listing 18).

由于所有数据都是唯一的，因此字母表集合不是一个合适的例子。 我们向本文开头创建的 colors 集合中添加一些记录（参见 清单 18）。

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However, having the database records locked is also a bad thing, because, for example, Mrs. Waldo can't access the money.

尽管如此，锁定数据库也可能是不好的事情，因为，打个比方，waldo夫人不能存取款。

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