Experimentar foi a ordem da noite ...
mysql> set @@global.expire_logs_days=0.75; ERROR 1232 (42000): Incorrect argument type to variable 'expire_logs_days' mysql> set @@global.expire_logs_days=.75; ERROR 1232 (42000): Incorrect argument type to variable 'expire_logs_days' mysql> set @@global.expire_logs_days=3.4; ERROR 1232 (42000): Incorrect argument type to variable 'expire_logs_days' mysql> set @@global.expire_logs_days=3/4; ERROR 1232 (42000): Incorrect argument type to variable 'expire_logs_days' mysql> set @@global.expire_logs_days=F; ERROR 1232 (42000): Incorrect argument type to variable 'expire_logs_days' mysql> set @@global.expire_logs_days=0xF; ERROR 1232 (42000): Incorrect argument type to variable 'expire_logs_days' mysql> set @@global.expire_logs_days=1; Query OK, 0 rows affected (0.00 sec)