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select @@global.character_sets_dir;
@@global.character_sets_dir
MYSQL_CHARSETSDIR/
select @@session.character_sets_dir;
ERROR HY000: Variable 'character_sets_dir' is a GLOBAL variable
show global variables like 'character_sets_dir';
Variable_name Value
character_sets_dir MYSQL_CHARSETSDIR/
show session variables like 'character_sets_dir';
Variable_name Value
character_sets_dir MYSQL_CHARSETSDIR/
select * from information_schema.global_variables where variable_name='character_sets_dir';
VARIABLE_NAME VARIABLE_VALUE
CHARACTER_SETS_DIR MYSQL_CHARSETSDIR/
select * from information_schema.session_variables where variable_name='character_sets_dir';
VARIABLE_NAME VARIABLE_VALUE
CHARACTER_SETS_DIR MYSQL_CHARSETSDIR/
set global character_sets_dir="foo";
ERROR HY000: Variable 'character_sets_dir' is a read only variable
set session character_sets_dir="foo";
ERROR HY000: Variable 'character_sets_dir' is a read only variable
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