1select @@global.character_sets_dir;
2@@global.character_sets_dir
3MYSQL_CHARSETSDIR/
4select @@session.character_sets_dir;
5ERROR HY000: Variable 'character_sets_dir' is a GLOBAL variable
6show global variables like 'character_sets_dir';
7Variable_name	Value
8character_sets_dir	MYSQL_CHARSETSDIR/
9show session variables like 'character_sets_dir';
10Variable_name	Value
11character_sets_dir	MYSQL_CHARSETSDIR/
12select * from information_schema.global_variables where variable_name='character_sets_dir';
13VARIABLE_NAME	VARIABLE_VALUE
14CHARACTER_SETS_DIR	MYSQL_CHARSETSDIR/
15select * from information_schema.session_variables where variable_name='character_sets_dir';
16VARIABLE_NAME	VARIABLE_VALUE
17CHARACTER_SETS_DIR	MYSQL_CHARSETSDIR/
18set global character_sets_dir="foo";
19ERROR HY000: Variable 'character_sets_dir' is a read only variable
20set session character_sets_dir="foo";
21ERROR HY000: Variable 'character_sets_dir' is a read only variable
22