MySQL中的连接错误太多

Question

I am developing an app using C# and MySql ( stored procedure ). After running the app for certain time it shows Too many connection . Then I used commands like SHOW STATUS WHERE variable_name = 'Threads_connected'; and SHOW PROCESSLIST; to debug the problem. It seems each time I run any action on my app, mysql creates new thread and the thread is marked as Sleep . Moreover the thread does not close on time. I found one solution ie setting mysql environment variables as below.

 interactive_timeout=180
 wait_timeout=180

1. Is this solution have any impact on the app as it automatically kills the connection? What happens if data fetching time from database is a bit long?
2. I am expecting huge traffic about 1000 at a time. So what should be the max connection number in mysql? Will that degrade the mysql performance?

[Note: There is no problem in my app as I have closed every mysql connection]

Thanks in advance.

Answer 1

I hope below artical will help you to get answer of your 2nd point

http://dev.mysql.com/doc/refman/5.5/en/too-many-connections.html

In cases where an application doesn't close connections properly, wait_timeout is an important parameter to tune and discard unused or idle connections to minimize the number of active connections to your MySQL server – and this will ultimately help to avoid the “Too many connections” error.

Threads_running is a valuable metric to monitor as it doesn't count sleeping threads – it shows active and the amount of queries currently processing, while threads_connected status variables show all connected threads value including idle connections as well