flush status;
flush hosts;
select @@global.debug;
@@global.debug

show global status like "connection_errors_%";
Variable_name	Value
Connection_errors_accept	0
Connection_errors_internal	0
Connection_errors_max_connections	0
Connection_errors_peer_address	0
Connection_errors_select	0
Connection_errors_tcpwrap	0
select "Con1 is alive";
Con1 is alive
Con1 is alive
select current_user();
current_user()
root@localhost
set global debug_dbug= "+d,vio_peer_addr_error";
ERROR HY000: Can't get hostname for your address
show global status like "connection_errors_%";
Variable_name	Value
Connection_errors_accept	0
Connection_errors_internal	0
Connection_errors_max_connections	0
Connection_errors_peer_address	1
Connection_errors_select	0
Connection_errors_tcpwrap	0
"Dumping performance_schema.host_cache"
ERROR HY000: Can't get hostname for your address
show global status like "connection_errors_%";
Variable_name	Value
Connection_errors_accept	0
Connection_errors_internal	0
Connection_errors_max_connections	0
Connection_errors_peer_address	2
Connection_errors_select	0
Connection_errors_tcpwrap	0
"Dumping performance_schema.host_cache"
set global debug_dbug= default;
flush status;
show global status like "connection_errors_%";
Variable_name	Value
Connection_errors_accept	0
Connection_errors_internal	0
Connection_errors_max_connections	0
Connection_errors_peer_address	0
Connection_errors_select	0
Connection_errors_tcpwrap	0