Oracle和DB 2 UDB都提供了一些有效的机制和功能，来保护数据不会由于媒介损坏或人为错误而丢失。

Oracle and DB2 UDB both provide effective mechanisms and capabilities for securing data from loss due to media corruption or human error.

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虽然数据保护提供了在故障时重新生成数据的能力，但是这并不涉及处于第一位的数据的有效性。

Although data protection provides the ability to regenerate data on a failure, it says nothing about the validity of the data in the first place.

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Ajax请求受到一个PHP驱动程序页的保护，该页先确保请求有效，然后将其传递到一个处理该请求的数据库包装类。

The Ajax requests are fielded by a PHP driver page, which makes sure that the request is valid and then passes it onto a database wrapper class that handles the request.

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