[TIL] 0328

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Today I Learnt 

 

0328: 

 

 

 

 

몽고 db자채에있는  aggregate와 mongoose 의populate함수 비교 

 

https://stackoverflow.com/questions/55575806/mongoose-populate-vs-aggregate

Mongoose populate vs aggregate

 

Here's a summary of the differences:

$lookup

• can only be used with aggregate
• can only be used to pull in referenced documents from unsharded collections
• can pull in referenced documents by any field
• generally more performant as it's a server-side operation
• requires MongoDB 3.2+

Mongoose populate()

• can be used with find and aggregate
• can be used to to pull in referenced documents from both sharded and unsharded collections
• can only pull in referenced documents by _id
• no MongoDB version requirement

차이점은 이렇게 정리되었다고하지만 그럼 속도는 뭐가더빠를까?

 

https://medium.com/cameoeng/mongodb-lookups-and-populates-an-unexpected-journey-940e08e36a94

MongoDB Lookups and Populates: An Unexpected Journey

 

document가 20개미만일때만, look up이빠르고 아니면 populate가더빠름. 

 

 

https://nangkyeong.tistory.com/entry/MongoDB-in-Action%EC%9C%BC%EB%A1%9C-%EC%A0%95%EB%A6%AC%ED%95%B4%EB%B3%B4%EB%8A%94-MongoDB%EC%9D%98-%EC%9D%B8%EB%8D%B1%EC%8A%A4-%EA%B0%9C%EB%85%90

'MongoDB in Action'으로 정리해보는 MongoDB의 인덱스 개념

 

짧지만 중요한 오늘! TIL 끝