How unsafe is to use ctrl+c or ctrl+d in mysql prompt?

Question

How unsafe is to use ctrl + c when in mysql prompt whether to interrupt a hanging statement or ctrl + d to exit?

When I do ctr + d for exit mysql can see a ¿special character? typed besides Bye

mysql> ^DBye

Doing ctrl + c for exit mysql

mysql> Ctrl-C -- exit!
Aborted

Doing ctrl + c to cancel or interrupt a query with a huge row impression

mysql> SELECT * FROM db.table ORDER BY column DESC;
........
........
........
........
Ctrl-C -- sending "KILL QUERY 126537" to server ...
Ctrl-C -- query aborted.

But when trying to re-execute an improved query

mysql> SELECT * FROM db.table ORDER BY column DESC LIMIT 10;
ERROR 1317 (70100): Query execution was interrupted

Need to execute again and no error's returned.

I want to know if there's some security or safety stuff related to this.