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