另外，数据库搜索不适合于相关排序、模糊搜索和多关键字。
Besides, database search is not designed for relevance ranking, fuzzy search or multiple keywords.
相关排序技术是搜索引擎结果处理的一个核心技术，其排序算法的优劣直接影响查准率。
The relevance ranking technology is a core technology of the search engine result reduction, and the ranking algorithm is directly influence the accuracy ratio.
为实现高性能、灵活性以及相关排序等，一些搜索引擎与数据库直接相连，从数据库提取数据并生成索引。
To achieve high performance, flexibility, relevance ranking, and so on, some search engines connect to databases directly, extract data, and generate indexes from databases.
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