Usually media failure is caused by either the complete loss of a data file or a system change number (SCN) time stamp being out of sync with the rest of the database.

通常媒体故障是由于数据文件完全丢失或系统更改编号（System Change Number，SCN）时间戳与数据库的其余部分不同步造成的。

youdao

In this case, mocking out the database interaction allows you to focus on the Grails functionality, doing it in a fraction of the time it would otherwise take.

在这种情况下，模拟数据库交互可以使您专注于Grails功能，只花少部分时间来进行测试。

youdao

Retrieving a single Person out of the database could very well lead to retrieving all of humanity back to the beginning of time.

仅仅是从数据库中取出一个Person就会导致追溯到所有人类的源头。

youdao

So every time the tag is read, a real-time connection to that database is needed to work out how to route the bag.

ECONOMIST: REPORTS