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    # 이야기 나온것 정리 - 4장 부터 진행 - 스터디 일시: 매주 토요일 오전 10시 부터 2시간 - 서기: 한사람이 목차를 마크다운으로 정리해서 레포에 올리기 - 서기는 한명 씩 돌아가면서 한다. - 서기가 정리한 목차를 바탕으로 진행하기 - 서기가 정리한 목차에다가 같이 이야기 나누고 싶은거 답변 달기. - 스터디날에 모여서 답변을 기준으로 질의응답하는 시간 갖기. - 한번 읽어오기 - 아예 안읽으니 따라오기 힘들기도 하고 집중도 하락 - 다같이 모여서 정리한 후 깃에 업로드 - 서기 역할 - 그 주에 할 주제에 대해서 목차 정리 - (ex 숫자 4.1.2.1 포그라운드 스레드(클라이언트 스레드)) - Issue 생성 하고 - HackMD 로 작성한 거 취합해서 커밋하기 - 서기가 불참하더라도 깃허브에 코드 업로드까지는 하기! - 커밋 컨벤션 없음 - 알잘딱 대충 하기 # 4.1 MySQL 엔진 아키텍쳐 ## MySQL 서버 구조 - MySQL 독특한 구조 - 보통은 모놀리식 같은 느낌 - MySQL 은 plugin 형태 (MSA 같은 느낌?) 으로 잘 나뉘어짐 - 장점 - 유지보수 좋음 - 단점 - 예상과 다른 동작을 할 수 있는 복잡함 - MySQL 엔진 - SQL 인터페이스 - SQL 파서 - SQL 옵티마이저 - 캐시 & 버퍼 - 스토리지 엔진 - InnoDB - MyISAM - Memory - 성능 향상을 위해서 키 캐시(MyISAM) 버퍼풀 (InnoDB) ## 핸들러 API - `SHOW GLOBAL STATUS LIKE 'Handler%'`; - MySQL 엔진과 스토리지 엔진 사이에 주고받는 API ## MySQL 스레딩 구조

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