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      <title>[PostgreSQL] VACUUM은 도는데 죽은 튜플이 안 줄어들 때</title>
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      <description>VACUUM은 아직 누군가 볼 수 있는 튜플을 지우지 못합니다. 오래 열려 있는 트랜잭션, 방치된 복제 슬롯, 준비된 트랜잭션이 정리 기준선을 붙잡는 구조와 진단 순서를 정리합니다.</description>
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