Which two statements are true about InnoDB auto-increment locking? A. The auto-increment lock can be a table-level lock. B. InnoDB never uses table-level locks. C. Some settings for innodb_autoinc_lock_mode can help reduce locking. D. InnoDB always protects auto-increment updates with a table-level lock. E. InnoDB does not use locks to enforce auto-increment uniqueness. 答案:AC