✅ 운영체제 하드웨어를 편하게 사용할 수 있게 해주는 소프트웨어 하드웨어를 다루는 복잡한 부분은 운영체제가 담당해준다. 프로그램 입장에서는 혼자서 하드웨어를 쓰고 있다고 생각 운영체제는 하드웨어와 다른 소프트웨어 또는 사용자를 연결해준다. 컴퓨터가 부팅되면, 메모리에 올라간다. 메모리에 상주하는 운영체제의 핵심 부분은 ke...

✅ Connect SSH into instance SSH로 instance에 연결할 수 있어야 한다. 햔재 Elastic public IP = 43.201.173.136 ssh -i solidtodo.pem ec2-user@43.201.173.136 ✅ 가비아에서 도메인 구매 참고 https://velog.io/@b1rdn2...

✅ JPA Java Persistence API 💡 Java JPA https://soheeparklee.github.io/posts/Spring_jpa/#-jpa ORM of JAVA Map Object and DB developer does not have to write SQL 👍🏻 code reusa...

✅ Database Optmizier part of DB management system decide how to optimize DB query affect overal system performance

✅ MySQL 👍🏻 open-source 👍🏻 supported ⬆️ 👍🏻 easy to install 👍🏻 community 👎🏻 big data 👎🏻 limited advanced functions ✅ Oracle 👍🏻 support advanced functions 👍🏻 adequate for managin...

⭐️ common ground: methods for enhancing DB availability, reliability ✅ DB Clustering distributed database system across parallel nodes by grouping interconnected servers to work as a sing...

✅ Table Full Scan read all blocks in table to find data used for database optimization, optimizing query 👎🏻 can affect database performance if the table is big, query is complex ✅ Index R...

✅ Schema define database structure and constraints logical representation of data shows how data in DB should be stored logically attribute: characteristic of entity entity: collectio...

✅ NoSQL unrelational DB not only SQL can use query language depending on API/DB/query 👍🏻 scalability 👍🏻 availability 👍🏻 data is saved according to how application is used 👍...

✅ ORM Object Relational Mapping Map object and relational DB automatically save burden to code SQL Object oriented programming: use class Relational DB: use table thus, there ...