Creating a copy of a database in PostgreSQL
将整个数据库（其结构和数据）复制到pgAdmin中的新数据库的正确方法是什么？
Postgres allows the use of any existing database on the server as a template when creating a new database. I'm not sure whether pgAdmin gives you the option on the create database dialog but you should be able to execute the following in a query window if it doesn't:
CREATE DATABASE newdb WITH TEMPLATE originaldb OWNER dbuser;
Still, you may get:
ERROR: source database "originaldb" is being accessed by other users
To fix it you can use this query
SELECT pg_terminate_backend(pg_stat_activity.pid) FROM pg_stat_activity
WHERE pg_stat_activity.datname = 'originaldb' AND pid <> pg_backend_pid();
A command-line version of Bell's answer:
createdb -O ownername -T originaldb newdb
This should be run under the privileges of the database master, usually postgres.
To clone an existing database with postgres you can do that
/* KILL ALL EXISTING CONNECTION FROM ORIGINAL DB (sourcedb)*/
SELECT pg_terminate_backend(pg_stat_activity.pid) FROM pg_stat_activity
WHERE pg_stat_activity.datname = 'SOURCE_DB' AND pid <> pg_backend_pid();
/* CLONE DATABASE TO NEW ONE(TARGET_DB) */
CREATE DATABASE TARGET_DB WITH TEMPLATE SOURCE_DB OWNER USER_DB;
IT will kill all the connection to the source db avoiding the error
ERROR: source database "SOURCE_DB" is being accessed by other users