March 2021
Beginner to intermediate
600 pages
12h 19m
Korean
Content preview from 몽고DB 완벽 가이드(3판): 실전 예제로 배우는 NoSQL 데이터베이스 기초부터 활용까지
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216
2
부
몽고DB 개발
6.4
TTL
인덱스
6
.
3
절에서 설명했듯 제한 컬렉션 내용이 덮어쓰일 때는 제어할 수 없다. 오래된 순 삭제 시스
템을 더 유연하게 만들려면
TTL
인덱스를 이용해서 각 도큐먼트에 유효 시간을 설정할 수 있
다. 도큐먼트는 미리 설정한 시간에 도달하면 지워진다. 이런 인덱스는 세션 스토리지와 같은
문제를 캐싱하는 데 유용하다.
createIndex
의 두 번째 인자에
"
expireAfterSeconds
"
옵션을 명시해
TTL
인덱스를 생성
한다.
> // 24시간 뒤 타임아웃
> db.sessions.createIndex({"lastUpdated" : 1}, {"expireAfterSeconds" : 60*60*24})
명령은
"
lastUpdated
"
필드에
TTL
인덱스를 생성한다. 도큐먼트에
"
lastUpdated
"
필드가
존재하고 날짜형이라면, 서버 시간이 도큐먼트 시간의
"
expireAfterSeconds
"
초를 지나면
도큐먼트가 삭제된다.
활동 중인 세션이 삭제되는 것을 방지하려면 활동
activity
이 있을 때마다
"
lastUpdate
"
필드를
현재 시간으로 갱신한다.
"
lastUpdated
"
가
24
시간이 지나면 도큐먼트는 삭제된다.
몽고
DB
는
TTL
인덱스를 매분마다 청소하므로 초 단위로 신경 쓸 필요 없다.
collMod ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.