text: --source include/not_embedded.inc
  --source include/have_perfschema.inc
  
  #
  # Only global
  #
  
  select @@global.performance_schema_max_thread_classes;
  
  --error ER_INCORRECT_GLOBAL_LOCAL_VAR
  select @@session.performance_schema_max_thread_classes;
  
  show global variables like 'performance_schema_max_thread_classes';
  
  show session variables like 'performance_schema_max_thread_classes';
  
  select * from information_schema.global_variables
    where variable_name='performance_schema_max_thread_classes';
  
  select * from information_schema.session_variables
    where variable_name='performance_schema_max_thread_classes';
  
  #
  # Read-only
  #
  
  --error ER_INCORRECT_GLOBAL_LOCAL_VAR
  set global performance_schema_max_thread_classes=1;
  
  --error ER_INCORRECT_GLOBAL_LOCAL_VAR
  set session performance_schema_max_thread_classes=1;
  
  