1.重置SYSTEM DB
su - hdbadm
HDB stop
-- open a another ssh session
su - hdbadm
hdbenv.ssh
hdbnameserver -resetUserSystem
-- go back to original ssh session
HDB start
2.重置Tenant DB
--login system db
ALTER SYSTEM STOP DATABASE TEST
ALTER DATABASE TEST SYSTEM USER PASSWORD "new_password"
--login hana studio change system user password again