Should an ID become compromised, a new public key can be generated by the creation of a new ID, locking the old ID out of the system.
如果一个ID存在安全危险，那么应该通过创建一个新的ID生成一个新的公钥，在系统中锁定老的ID。
3
In fact, the only row-level locking that remains during INSERT is the next-key locks that are required to protect an INSERT from adding keys to repeatable read scanners.