按照最佳实践，消息传递引擎的数据库是通过执行生成的ddl脚本创建的。

Following best practices, the database for a messaging engine is created by executing a generated DDL script.

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为从深层网络提取有意义的数据，搜索引擎必须分析用户的搜索词，找出如何最佳负责安排这些查询调度给特定的数据库。

To extract meaningful data from the Deep Web, search engines have to analyze users' search terms and figure out how to broker those queries to particular databases.

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