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POSSO - Share single User table between several websites or somehow keep multiple User tables in sync?
 

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    <p>I'm working on a single sign-on solution for two ASP.NET MVC3 websites. The sites are on separate subdomains. I'm using Forms Authentication and so far I everything is working well. When I sign into a.example.com I'm automatically signed in to b.example.com too. Nice.</p> <p>Each application has its own database.</p> <p>My question is this - if I want to keep certain user information in sync between the two sites (say the last activity date or some user preference) then should I have a User table in both databases and somehow keep them in sync or should only a.example.com's database have a User table and b.example.com somehow reads and writes to it?</p> <p>Thanks for your advice.</p> <p><strong>Edit:</strong> Thanks to adam I'm leaning towards storing all user data in a separate database. I will pass the authenticated user's username and ID to each application in the authentication cookie. Can anybody offer any advice around maintaining referential integrity between the two databases?</p>
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