在PostgreSQL中，要将数据库从服务器1复制到服务器2，可以使用以下哪种方法:( )
pg_mv -h server1 database | pgsql -h server2 database
pg_dump -h server1 database > pgsql -h server2 database
pg_dump -h server1 database | psql -h server2 database
pg_copy -h server1 database | psql -h server2 database
