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I am wondering what are the reasons or maybe technical limitations all of Sitecore 9 databases to be Partially Contained except Xdb.Collection.Shard0, Xdb.Collection.Shard1 and Xdb.Collection.ShardMapManager.

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xConnect uses a change tracking functionality which requires a SQL User so it can access multiple databases. For this reason, contained database authentication cannot be used on the xDB Collection databases (shards and shard manager).

Source info (from @Rosen Petrov): https://www.timmitchell.net/post/2016/11/18/video-introduction-to-sql-server-change-tracking/

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