求翻译：1、单一的用户信息数据库并不是必须的，有许多系统不能将所有的用户信息都集中存储，应该允许用户信息放置在不同的存储中，如下图所示。事实上，只要统一认证系统，统一ticket的产生和效验，无论用户信息存储在什么地方，都能实现单点登录。是什么意思？

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1st, the sole user information database is not must, some many systems cannot all strongly save all user information, should allow the user information to lay aside in the different memory, the following chart shows.In fact, so long as the unification authentication system, unifies ticket the produc

1, a single database of user information is not required, many systems do not have all the user information is centrally stored, should allow the user to place information in a variety of stores, as shown in the following figure. In fact, as long as the unified authentication system, and effectivene

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