Ever since upgrading to Percona 5.7 (from 5.6) we’ve been getting a lot of “Too many connections” messages from one of our rails apps. I’ve increased the max_connection from 256 to 1024 with no effect. Is there anything in the way percona 5.7 handles connections (or sleeping connections) that would cause something like this?
Also, this doesn’t happen constantly, it is pretty unpredictable.
Current: mysql Ver 14.14 Distrib 5.7.18-15, for debian-linux-gnu (x86_64) using 6.3