Because of strong data isolation and compliance requirements of the tenant, user data may reside in a dedicated database in an on demand environment for each of the tenants.
由于承租者高度的数据隔离和遵从性需求，用户数据可能位于按需环境中的专用数据库(用于每个承租者)中。
The logical model of the database is simply a representation of all the data requirements of the user, put into a normalized form.
数据库的逻辑模型仅仅是对用户的所有数据需求的一种表示，它将这些需求变成一种范式。
Otherwise, you'll simply get an error. When all the requirements are met, make sure that the user name does not already exist in the database.
否则，只能是一个错误，当所有需求都满足之后，确保用户名不和数据库中现有的用户名重复，如果是重复了，也是返回一个错误。
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