日常使用navicat或者python的pymysql连接操作腾讯Mysql云数据库，最近偶尔会显示连接不上，第二次重试后，又能顺利连接。请问这是什么原因？
Traceback (most recent call last):
File "D:\Anaconda\lib\site-packages\pymysql\connections.py", line 583, in connect
**kwargs)
File "D:\Anaconda\lib\socket.py", line 707, in create_connection
for res in getaddrinfo(host, port, 0, SOCK_STREAM):
File "D:\Anaconda\lib\socket.py", line 752, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
gaierror: [Errno 11001] getaddrinfo failed
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "我运行的py文件路径", line 19, in
db = pymysql.connect("我的腾讯云数据库地址","我的账号","我的密码","连接的库名",端口号)
File "D:\Anaconda\lib\site-packages\pymysql__init__.py", line 94, in Connect
return Connection(*args, **kwargs)
File "D:\Anaconda\lib\site-packages\pymysql\connections.py", line 325, in init
self.connect()
File "D:\Anaconda\lib\site-packages\pymysql\connections.py", line 630, in connect
raise exc
OperationalError: (2003, "Can't connect to MySQL server on '我的腾讯云数据库地址' ([Errno 11001] getaddrinfo failed)")
