MYSQL 启动报错undo个数不对

[ERROR] InnoDB: Expected to open 3 undo tablespaces but was able to find only 0 undo tablespaces. Set the innodb_undo_tablespaces parameter to the correct value and retry. Suggested value is 0

解决办法：

配置文件 my.cnf 中修改 innodb_undo_tablespaces=0 再启动。