需要必须掌握的命令，上周遇到了一个小问题，就是需要重启数据库监听，有的同学竟然使用oracle用户重启监听，原理就搞错了怎么行。以下操作都需要再grid用户下进行操作。

1、查看监听状态

$srvctl status listener
Listener LISTENER is enabled
Listener LISTENER is running on node(s): roidb1,roidb2
$srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is running on node roidb2
$

2、关闭监听

$srvctl stop listener -n roidb1
$srvctl status listener -n roidb1
Listener LISTENER is enabled on node(s): roidb1
Listener LISTENER is not running on node(s): roidb1
$
$srvctl stop scan_listener
$srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is not running
$

3、启动监听

$srvctl status listener
Listener LISTENER is enabled
Listener LISTENER is running on node(s): roidb1,roidb2
$srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is running on node roidb2
$