The database for Administrator is configured exactly the same way as SkyVault Process Services. See the Database configuration section.
For example (using MySQL):
datasource.driver=com.mysql.jdbc.Driver datasource.url=jdbc:mysql://127.0.0.1:3306/activitiadmin?characterEncoding=UTF-8 datasource.username=SkyVault datasource.password=SkyVault hibernate.dialect=org.hibernate.dialect.MySQLDialect