When you use an existing database rather than the database bundled with vCenter Single Sign-On, the installation process requires database users with certain permissions.

When you install Single Sign-On installation using an existing database, the installer requires you to enter the user names and passwords of an existing database administrator and a database user.

When you install Single Sign-On with the bundled Microsoft SQL Server 2008 R2 Express database, the installer creates two users:

A database administrator user (for example, RSA_DBA) and password, which are used to set up the Single Sign-On database schema.

A database user (for example, RSA_USER) and password, which are used to perform certain steps after the installation.

The installer prompts you to enter the passwords for these users.