참고

• https://techblog.woowahan.com/9478/

• https://www.postgresql.kr/docs/9.4/routine-vacuuming.html

• https://www.cybertec-postgresql.com/en/a-beginners-guide-to-postgresqls-update-and-autovacuum/

• https://nrise.github.io/posts/postgresql-autovacuum/