I have a registration application. 10000 people want to access the server but only 3000 quotas available. 3000 users registered successfully online within 3 minutes on the registration day. However, some users encounter 504 error page (Gateway time out). I checked the
max_used_connections variable, the value is 10 only. The
max_connections value is 151.
max_used_connections is defined as
the maximum number of connections that have been in use simultaneously since the server started.
I wonder why the value is only 10. Is it too small compared with 3000 users registered successfully online within 3 minutes?