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I'm chasing connection issues with a very busy MySQL server and I've increased the back_log setting from the default of 50 to 2048. I can see that the setting has taken affect in the DB, but I was hoping there was a way to view the actual number of connections that are being queued, so that I can verify this has solved my problem.

Is this possible?

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You can execute SHOW FULL PROCESSLIST and see the # of rows this indicates # of connections (connection threads connected) to the server. –  Mahesh Patil Dec 16 '13 at 11:23

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