![PostgreSQL 데이터베이스 서버를 시작할 수 없습니다. ——갑자기 [닫음]](https://linux55.com/image/99087/PostgreSQL%20%EB%8D%B0%EC%9D%B4%ED%84%B0%EB%B2%A0%EC%9D%B4%EC%8A%A4%20%EC%84%9C%EB%B2%84%EB%A5%BC%20%EC%8B%9C%EC%9E%91%ED%95%A0%20%EC%88%98%20%EC%97%86%EC%8A%B5%EB%8B%88%EB%8B%A4.%20%E2%80%94%E2%80%94%EA%B0%91%EC%9E%90%EA%B8%B0%20%5B%EB%8B%AB%EC%9D%8C%5D.png)
갑자기 postgresql이 충돌했습니다.
$ sudo systemctl status postgresql
● postgresql.service - PostgreSQL database server
Loaded: loaded (/usr/lib/systemd/system/postgresql.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Sat 2016-11-19 11:09:41 ICT; 8s ago
Process: 20873 ExecStartPre=/usr/bin/postgresql-check-db-dir ${PGROOT}/data (code=exited, status=1/FAILURE)
Nov 19 11:09:40 my_notebook systemd[1]: Starting PostgreSQL database server...
Nov 19 11:09:41 my_notebook systemd[1]: postgresql.service: Control process exited, code=exited status=1
Nov 19 11:09:41 my_notebook systemd[1]: Failed to start PostgreSQL database server.
Nov 19 11:09:41 my_notebook systemd[1]: postgresql.service: Unit entered failed state.
Nov 19 11:09:41 my_notebook systemd[1]: postgresql.service: Failed with result 'exit-code'.
이유는 무엇입니까?