JSON Spawning mysql sleep processes

I am in the process of making a Javascript(Front end, PHP back end) game. In this game it checks the server for updates every 2 seconds. There is one 1 sql call being run and at the end I use $mysqli->close() to close the SQL connection. The columns in th开发者_运维知识库e where are both indexed.

The problem I am having is after its running for a little while MYSQL starts spawning tons of sleep processes. Does anyone have any idea what might be causing this?

I'd push updates to your users instead of polling for them. Check out the AJAX Push Engine, that can help a lot. Also, turn on persistent MySQL connections, that could help.

Do the processes stick around? Mysql likes to keep a few threads open to recieve requests, i wouldn't worry about them unless it leaving a lot of them open and there taking up resources.

If your hitting the request every 2 seconds its cheaper to keep the pool waiting for a request than instantiating a connection every time.