筆者系統為 mac ，不知怎的，Mysql 竟然報如下錯誤：
ERROR 1449 (HY000): The user specified as a definer ('mysql.infoschema'@'localhost') does not exist
一時沒有找到是什么操作導致的這個錯誤。然后經過查詢，參考文章
解決了問題。
登錄
$ mysql -uroot -p12345678
$ mysql> show databases;
ERROR 1449 (HY000): The user specified as a definer ('mysql.infoschema'@'localhost') does not exist
修改
$ mysql> SET GLOBAL innodb_fast_shutdown = 1;
Query OK, 0 rows affected (0.01 sec)
$ mysql> quit
Bye
更新
$ mysql_upgrade -uroot -p12345678
mysql_upgrade: [Warning] Using a password on the command line interface can be insecure.
Checking if update is needed.
Checking server version.
Running queries to upgrade MySQL server.
Upgrading system table data.
Checking system database.
mysql.columns_priv OK
mysql.component OK
……
yn.roles OK
yn.users OK
Upgrade process completed successfully.
Checking if update is needed.
重新登錄之后，服務恢復正常。
)
