How to duplicate the database in postgresql?

Question

I need to duplicate the existing database including its schema and structure to another new database. I need this in shell command environment and not in pgadmin. Please kindly help me.

nohup pg_dump exampledb > example-01.sql
createdb -O postgres exampledbclone_01

my user is "postgres"

nohup psql exampledbclone_01 < example-01.sql

$ pg_dump mydb > db.sql
$ psql -d newdb -f db.sql

Answer 1

If you want to duplicate it within the same PostgreSQL install and you don't have actively connected users there's a handy shortcut:

CREATE DATABASE my_new_database TEMPLATE my_old_database;

or from the shell

createdb -T my_old_database my_new_database;

Otherwise you'll need to use pg_dump, createdb and pg_restore, e.g.

pg_dump -Fc -f olddb.pgdump -d olddb &&\
createdb newdb &&\
pg_restore -d newdb olddb.pgdump

If you're using nohup so the command doesn't die if you lose your ssh session, consider using screen instead.