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