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    <p>Now here is how I would approach it. This is based on RaccoonBlog PostComments</p> <p>I would store each users events in a separate document (i.e. UserEvent in the example below) with the user having an additional property linking to it along with a number of events and a timestamp of the last event associated with the user. This would keep the user document much smaller but having alot of the important information</p> <p>In UserEvent it would be a simple document holding id, link to the userid this document references, a "event" collection, and a lasteventid. This way each "event" becomes a sub document for maintenance if needed.</p> <p>Lastly a Index on UserEvent that allows you to query the data easily</p> <pre><code>public class User { public string Id { get; set; } // other user properties public string UserEventId { get; set; } public int NumberOfEvents { get; set; } public DateTimeOffset LastEvent { get; set; } } public class UserEvent { public string Id { get; set; } public string UserId { get; set; } public int LastEventId { get; set; } public ICollection&lt;Event&gt; Events { get; protected set; } public int GenerateEventId() { return ++LastEventId; } public class Event { public int Id { get; set; } public DateTimeOffset CreatedAt { get; set; } public string ActivityType { get; set; } // other event properties } } public class UserEvents_CreationDate : AbstractIndexCreationTask&lt;UserEvent, UserEvents_CreationDate.ReduceResult&gt; { public UserEvents_CreationDate() { Map = userEvents =&gt; from userEvent in userEvents from evt in userEvent.Events select new { evt.CreatedAt, EventId = evt.Id, UserEventId = userEvent.Id, userEvent.UserId, evt.ActivityType }; Store(x =&gt; x.CreatedAt, FieldStorage.Yes); Store(x =&gt; x.EventId, FieldStorage.Yes); Store(x =&gt; x.UserEventId, FieldStorage.Yes); Store(x =&gt; x.UserId, FieldStorage.Yes); Store(x =&gt; x.ActivityType, FieldStorage.Yes); } public class ReduceResult { public DateTimeOffset CreatedAt { get; set; } public int EventId { get; set; } public string UserEventId { get; set; } public string UserId { get; set; } public string ActivityType { get; set; } } } public static class Helpers { public static DateTimeOffset AsMinutes(this DateTimeOffset self) { return new DateTimeOffset(self.Year, self.Month, self.Day, self.Hour, self.Minute, 0, 0, self.Offset); } public static IList&lt;Tuple&lt;UserEvents_CreationDate.ReduceResult, User&gt;&gt; QueryForRecentEvents( this IDocumentSession documentSession, Func &lt;IRavenQueryable&lt;UserEvents_CreationDate.ReduceResult&gt;, IQueryable&lt;UserEvents_CreationDate.ReduceResult&gt; &gt; processQuery) { IRavenQueryable&lt;UserEvents_CreationDate.ReduceResult&gt; query = documentSession .Query&lt;UserEvents_CreationDate.ReduceResult, UserEvents_CreationDate&gt;() .Include(comment =&gt; comment.UserEventId) .Include(comment =&gt; comment.UserId) .OrderByDescending(x =&gt; x.CreatedAt) .Where(x =&gt; x.CreatedAt &lt; DateTimeOffset.Now.AsMinutes()) .AsProjection&lt;UserEvents_CreationDate.ReduceResult&gt;(); List&lt;UserEvents_CreationDate.ReduceResult&gt; list = processQuery(query).ToList(); return (from identifier in list let user = documentSession.Load&lt;User&gt;(identifier.UserId) select Tuple.Create(identifier, user)) .ToList(); } } </code></pre> <p>Then all you have to do to query is something like.</p> <pre><code> documentSession.QueryForRecentEvents(q =&gt; q.Where(x =&gt; x.UserId == user.Id &amp;&amp; x.ActivityType == "asfd").Take(20)).Select(x =&gt; x.Item1); </code></pre>
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    1. COI like it, +1 for including an index!
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