fix: practice_result 테이블에 (type, started_at) 복합 인덱스 추가로 랭킹 조회 커넥션 고갈 방지#43
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fix: practice_result 테이블에 (type, started_at) 복합 인덱스 추가로 랭킹 조회 커넥션 고갈 방지#43Jeongho0805 wants to merge 1 commit into
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변경 사항
PracticeResult엔티티에@Table(indexes = {...})선언 추가(type, started_at)복합 인덱스(idx_practice_result_type_started_at) 정의배경
Sentry 이슈 PRACTICKET-5D:
GET /api/practice/rank요청에서 HikariPool-1 커넥션 고갈 발생 (total=10, active=10, idle=0, waiting=190).PracticeRankRepositoryImpl.findRanking()이 실행하는 윈도우 함수 쿼리는WHERE type = :type AND started_at >= :startDateTime조건으로practice_result테이블을 조회한다. 해당 컬럼에 인덱스가 없어 매 요청마다 전체 테이블 스캔이 발생하고, 쿼리가 오래 걸리는 동안 DB 커넥션이 점유된다. 동시 요청이 증가하면 기본 풀 크기(10)가 모두 소진되어 이후 요청이 30초 타임아웃 후 실패한다.