db 덤프 생성 및 복원

postgresql은 db 백업/복원으로 pg_dump라는 유틸리티를 제공함

https://www.postgresql.org/docs/9.5/static/app-pgdump.html

pg_dump is a utility for backing up a PostgreSQL database. It makes consistent backups even if the database is being used concurrently. pg_dump does not block other users accessing the database (readers or writers).

pg_dump only dumps a single database. To backup global objects that are common to all databases in a cluster, such as roles and tablespaces, use pg_dumpall.

Dumps can be output in script or archive file formats. Script dumps are plain- text files containing the SQL commands required to reconstruct the database to the state it was in at the time it was saved. To restore from such a script, feed it to psql. Script files can be used to reconstruct the database even on other machines and other architectures; with some modifications, even on other SQL database products.

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