Postgresql dump (pg_dump)

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https://www.postgresql.org/docs/9.1/static/backup-dump.html
http://codeinpython.blogspot.com/2016/06/pgdump-version-mismatch-how-to-fix-on.html
https://severalnines.com/blog/upgrading-your-database-to-postgresql-version-10
https://discuss.circleci.com/t/postgres-9-5-3-pg-dump-version-mismatch/4238
https://coderwall.com/p/jso80q/pipe-viewer-views-pipes-and-long-running-restores

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