Is it possible to list MySQL Server closed connections?

To list active connections we do:

show processlist;

What to do to list old closed connections开发者_Go百科?

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The simple answer is that there's nothing provided by MySQL to list old connections. But you could capture the data flowing between your web front end and your database:

tcpdump -i eth0 -s 0 -w /tmp/mysql.cap tcp port 3306

run your PHP, have it fail, stop the capture and use Wireshark to see exactly what was going on.

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I could obtain this nice answer from serverfault.