You can use the following accounts to log on to the console:
Alibaba Cloud account: The account that allows flexible control of all your Alibaba Cloud resources and used for billing purposes. You must register an Alibaba Cloud account before purchasing any products.
RAM user (optional): You can create and manage accounts in the Resource Access Management (RAM) console for resource sharing purposes. A RAM user does not own any resources, and is billed based on the corresponding Alibaba Cloud account.
Accounts for POLARDB cluster
You can use the following accounts to log on to your POLARDB cluster.
Initial account: After purchasing a POLARDB cluster, you must create an initial account to access and manage the cluster. An initial account is an advanced user.
Classic user: A classic user can be created and managed using SQL commands after you log on to the database with the initial account.