쿼리플래닝 : https://www.postgresql.org/docs/current/runtime-config-query.html#RUNTIME-CONFIG-QUERY-CONSTANTS
쿼리성능분석하기 : https://seunghyunson.tistory.com/20
튜닝옵션 : https://blog.naver.com/qhanfckwsmsd/221534225572
