Transaction 단계 : start ➡️. RW operations ➡️ commit or abort ACID property Atomicity : All or nothing Consistency : Only valid data will be written to the database (referntial intergirty) Isolation : Transcations (occurring at the same time) do not impact each other Durability : Transcations committed to the database will not be lost Concurrency Control Concurrency Control을 통해 서로 다른 transaction의 ..