Performance can suffer because the database is too large for any significant part of it to fit in an in-memory cache.

性能也会受影响，因为数据库实在太大，数据库中的任何有效部分都无法装入内存中的缓存。

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For the most part, each database column is an attribute on the model.

大多数情况下，每个数据库列都是具体某个模型上的一个属性。

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At the end of this part of the series, you will have built the database, a PHP module for the core bank logic, and a single-page based browser user interface, which are all part of our bank scenario.

到本文结束时，我们会建立数据库、一个提供核心银行逻辑的PHP模块以及一个单页面浏览器用户界面，这些都是银行场景的组成部分。

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The actual number of people affected is expected to grow, in part because hackers accessed a database storing government forms used for security clearances, known as SF86 questionnaires, which contain the private information of multiple family members and associates for each government official affected, these officials said.

CNN: U.S.: Hack of 18 million Americans came from China