Proper Way to Retrieve More than 128 Documents with RavenDB

Question

I know variants of this question have been asked before (even by me), but I still don\'t understand a thing or two about this...

It was my understanding that one cou

Answer 1

You can also use a predefined index with the Stream method. You may use a Where clause on indexed fields.

var query = session.Query();
var query = session.Query().Where(x => !x.IsDeleted);

using (var enumerator = session.Advanced.Stream(query))
{
    while (enumerator.MoveNext())
    {
        var user = enumerator.Current.Document;
        // do something
    }
}

Example index:

public class MyUserIndex: AbstractIndexCreationTask
{
    public MyUserIndex()
    {
        this.Map = users =>
            from u in users
            select new
            {
                u.IsDeleted,
                u.Username,
            };
    }
}

Documentation: What are indexes? Session : Querying : How to stream query results?

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Important note: the Stream method will NOT track objects. If you change objects obtained from this method, SaveChanges() will not be aware of any change.

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Other note: you may get the following exception if you do not specify the index to use.

InvalidOperationException: StreamQuery does not support querying dynamic indexes. It is designed to be used with large data-sets and is unlikely to return all data-set after 15 sec of indexing, like Query() does.