複数のOracleサーバに接続する場合、tnsnames.oraに追加する
HOGE = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.10)(PORT = 1521)) ) (CONNECT_DATA = (SERVICE_NAME = hoge) ) ) PIYO = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.11)(PORT = 1521)) ) (CONNECT_DATA = (SERVICE_NAME = piyo) ) )