1set session debug="L";
2Warnings:
3Warning	1287	'@@debug' is deprecated and will be removed in a future release. Please use '@@debug_dbug' instead
4select @@global.debug="1";
5@@global.debug="1"
60
7select @@session.debug;
8@@session.debug
9L
10show global variables like 'debug';
11Variable_name	Value
12debug	#
13show session variables like 'debug';
14Variable_name	Value
15debug	L
16select * from information_schema.global_variables where variable_name="debug";
17VARIABLE_NAME	VARIABLE_VALUE
18DEBUG	#
19select * from information_schema.session_variables where variable_name="debug";
20VARIABLE_NAME	VARIABLE_VALUE
21DEBUG	L
22set @@global.debug=1;
23ERROR 42000: Incorrect argument type to variable 'debug'
24set @@global.debug=1.1;
25ERROR 42000: Incorrect argument type to variable 'debug'
26set @@global.debug=1e1;
27ERROR 42000: Incorrect argument type to variable 'debug'
28