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ES 与db 本身提供的索引查询有和区别 #2

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FS1360472174 opened this issue May 24, 2017 · 2 comments

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FS1360472174 commented May 24, 2017 •

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区别，为什么需要多一层
为什么不能不是ES 作为数据存储
搜索包括模糊查询

Owner Author

FS1360472174 commented May 24, 2017

数据库存储的一般是结构化、半结构化等数据
数据库索引是对字段的重排序
但是对于like "%dsaf%" 这样的模糊查询数据库索引是起不了作用的
ES 做的事就是建立一个反向索引机制，将数据关键词抽取，然后进行索引排序

Owner Author

FS1360472174 commented May 24, 2017

ES 本身也可以作为NoSQL数据库，schema-free 原因在于

默认在索引中保存原始数据，并可获取(Lucene 的store功能)
有translog，不会丢数据

http://jolestar.com/elasticsearch-architecture/

FS1360472174 closed this as completed

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