MySQL 8.0在执行DDL操作时存在导致数据丢失的情况让广大用户担忧。 无论是对于开发者还是企业用户而言，数据就如同企业的生命线，任何数据丢失 ...

Most of the online DDL operations can be performed in-place, though some data copying or reorganization may be involved. The MySQL 5.6 Reference Manual includes a full list of new features.