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select @@global.init_file;
@@global.init_file
NULL
select @@session.init_file;
ERROR HY000: Variable 'init_file' is a GLOBAL variable
show global variables like 'init_file';
Variable_name Value
init_file
show session variables like 'init_file';
Variable_name Value
init_file
select * from information_schema.global_variables where variable_name='init_file';
VARIABLE_NAME VARIABLE_VALUE
INIT_FILE
select * from information_schema.session_variables where variable_name='init_file';
VARIABLE_NAME VARIABLE_VALUE
INIT_FILE
set global init_file=1;
ERROR HY000: Variable 'init_file' is a read only variable
set session init_file=1;
ERROR HY000: Variable 'init_file' is a read only variable
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