我使用centos6 hortonworks沙盒。当我跑步时：

[root@sandbox-hdp ~]# service mysqld stop

它停了，我检查了一下：

[root@sandbox-hdp ~]# service mysqld status
mysqld is stopped

到目前为止一切都很好。但当我试着从这个开始时：

[root@sandbox-hdp ~]# service mysqld start
Starting mysqld:                                           [  OK  ]

我又查了一遍：

[root@sandbox-hdp ~]# service mysqld status
mysqld is stopped

但奇怪的事情正在发生：

[root@sandbox-hdp ~]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 5486
Server version: 5.6.39 MySQL Community Server (GPL)

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Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

我不明白怎么会这样？