##不重啓數據庫，更新配置
/usr/local/pgsql/bin/pg_ctl reload -D /home/postgres/data
遠程備份：
/usr/local/pgsql/bin/pg_dump dbname -f db_backup -h 192.168.1.2 -U username
遠程還原：
/usr/local/pgsql/bin/psql -h 192.168.1.2 -U username -d dbname < db_backup
連接數據庫
/usr/local/pgsql/bin/psql -h 192.168.1.2 -U username -d dbname