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    <p>SQL Server Express is full featured DBMS, with some limitations in terms of database size and resources it is allowed to use. You can see it's limitations (relative to SQL Server) <a href="http://msdn.microsoft.com/en-us/library/cc645993%28v=SQL.110%29.aspx" rel="nofollow">on microsofts site (Features Supported by the Editions of SQL Server 2012)</a></p> <p>SQL Server CE is embedded database, meaning that it runs in user mode, it's easy to deploy (requires you to copy just few assemblies), lightweight but fast, can be run by a low privileged user. It's supported by NHibernate. However, has more limitations. To me most notable is that there are problems when you try to have multiple connections to same database. Although MS claims that this is supported, if you try this in Windows 2008 server, you will fail. And what's worse, such use scenario may lead to DB corruption. This means that you will effectively not be able to use some Management tool to update data while your service/website is running. Also, SQL Server Management studio doesn't support SQL CE anymore, so you will have to use a 3rd party tool, like Database.NET. It also does not support subqueries.</p> <p>localDB, having not used it, sounds like a compromise. It's a standalone database which is executed in user mode (can be used by low privilege user), but must be installed so you will need administrative privileges for that part. Offers set of capabilities of SQL Server Express. It's much larger than SQL CE, and also requires to be installed (unlike CE which is just binary drop in). Shortest overview of this DBMS <a href="http://www.sqlcoffee.com/SQLServer2012_0004.htm" rel="nofollow">can be found here.</a></p>
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