alter table performance_schema.status_by_user
add column foo integer;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'performance_schema'
truncate table performance_schema.status_by_user;
ALTER TABLE performance_schema.status_by_user
ADD INDEX test_index(VARIABLE_NAME);
ERROR 42000: Access denied for user 'root'@'localhost' to database 'performance_schema'
CREATE UNIQUE INDEX test_index
ON performance_schema.status_by_user(VARIABLE_NAME);
ERROR 42000: Access denied for user 'root'@'localhost' to database 'performance_schema'
DROP INDEX `USER`
  ON performance_schema.status_by_user;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'performance_schema'