흔히 쓰이는 Isolation Level 3개가 있음
Read commit is not enough
일단 다른 transaction이랑 conflict가 없다고 가정
![<https://s3-us-west-2.amazonaws.com/secure.notion-static.com/d3221aa8-170d-42e4-b440-76b1cd7e5fdc/Untitled.png>](<https://s3-us-west-2.amazonaws.com/secure.notion-static.com/d3221aa8-170d-42e4-b440-76b1cd7e5fdc/Untitled.png>)