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