两种方式 嵌套和父子关联

创新互联从2013年创立，是专业互联网技术服务公司，拥有项目做网站、成都网站建设网站策划，项目实施与项目整合能力。我们以让每一个梦想脱颖而出为使命，1280元崇左做网站,已为上家服务,为崇左各地企业和个人服务,联系电话:028-86922220

Nested

• Nested docs are stored in the same Lucene block as each other, which helps read/query performance. Reading a nested doc is faster than the equivalent parent/child.

• Updating a single field in a nested document (parent or nested children) forces ES to reindex the entire nested document. This can be very expensive for large nested docs

• "Cross referencing" nested documents is impossible

• Best suited for data that does not change frequently

Parent/Child

• Children are stored separately from the parent, but are routed to the same shard. So parent/children are slightly less performance on read/query than nested

• Parent/child mappings have a bit extra memory overhead, since ES maintains a "join" list in memory

• Updating a child doc does not affect the parent or any other children, which can potentially save a lot of indexing on large docs

• Sorting/scoring can be difficult with Parent/Child since the Has Child/Has Parent operations can be opaque at times

综上所述，两种方式均有利弊，官方建议，自己处理关联关系，减轻ES的压力。

另外有需要云服务器可以了解下创新互联scvps.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。

当前题目：elasticsearch关联查询对比-创新互联
URL分享：http://pwwzsj.com/article/cdeidg.html