Автор: Александр Краснов

https://riptutorial.com/postgresql/example/29417/foreign-data-wrapper

To access complete schema of server db instead of single table. Follow below steps:

1. Create EXTENSION :

    CREATE EXTENSION postgres_fdw;

2. Create SERVER :

    CREATE SERVER server_name FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host 'host_ip', 
    dbname 'db_name', port 'port_number');

3. Create USER MAPPING:

    CREATE USER MAPPING FOR CURRENT_USER
    SERVER server_name
    OPTIONS (user 'user_name', password 'password');

4. Create new schema to access schema of server DB:

   CREATE SCHEMA schema_name;

5. Import server schema:

     IMPORT FOREIGN SCHEMA schema_name_to_import_from_remote_db
     FROM SERVER server_name
     INTO schema_name;

6. Access any table of server schema:

    SELECT * FROM schema_name.table_name; 

This can be used to access multiple schema of remote DB.

Ниже написан скрипт для автоматического создания копии БД с последующим восстановлением на тестовой среде.

#!/bin/bash
echo "Архивация БД vote-dev"
dir_folder=/var/lib/postgresql/vote-dev
mkdir -p $dir_folder
cd $dir_folder
# создание backup
pg_dump vote-dev > $dir_folder/vote-dev-day_$(date +\%Y\%m\%d).bak
# disconnect БД
psql -c "SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE pid <> pg_backend_pid() AND datname = 'vote-test';"
# удаление и создание БД
dropdb vote-test
psql -c 'create database "vote-test";'
psql -c 'ALTER DATABASE "vote-test" OWNER TO mobnius;'
# восстановление резервной копии
psql -U postgres vote-test < $dir_folder/vote-dev-day_$(date +\%Y\%m\%d).bak
ls -1tr | head -n -7 | xargs -d '\n' rm -f --
echo "Завершено"