How to fix these, "SQL Error 1040: Too Many Connection"
even I try to put
max_user_connection=500
still "Too many connection"
解决方案
If you are running out of connections like this, chances are excellent that you are not closing the connections that you have open.
Review code that opens connections and ensure the connections are closed as soon as practical. Typically you want to make use of the using keyword around anything that implements IDisposable (including database connections) to ensure that such objects are disposed as soon as they leave the scope where they are needed.
You can check the current number of active connections with this query:
show processlist
