How to drop mysql system database for mysql 8 version

[Swarna Gowri]

Hi ,

In older versions mysql system database could be dropped and restored from backup. But in mysql 8, drop database gives error for "mysql" system db.

mysql> drop database mysql;
ERROR 3552 (HY000): Access to system schema 'mysql' is rejected.

In case the database gets corrupted what is the recommended method to restore the database? I use mysqldump to backup to database.Also, why is the restriction introduced in mysql 8

Thanks,