Percona Server for MySQL Highlights – binlog space limit: A Feature to Prevent Disk Full and Server

Adding suffix _vip to client protocols (that is all, except replication, for instance mysql_vip or http_vip or just _vip) forces creating a dedicated thread for the connection to bypass different limitations. That's useful for node maintenance in case of a severe overload when the server would either stall or not let you connect via a regular port otherwise.

Maximum number of simultaneous client connections. Unlimited by default. That is usually noticeable only when using any kind of persistent connections, like cli mysql sessions or persistent remote connections from remote distributed tables. When the limit is exceeded you can still connect to the server using the VIP connection. VIP connections are not counted towards the limit.

Percona Server for MySQL Highlights – binlog space limit

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