Question

While querying RavenDB I am noticing that it does not get the expected results immediately. May be it has to do with indexing, I dont know.

For example :

   int ACount = session.Query<Patron>()
                   .Count();

   int BCount = session.Query<Theaters>()
                   .Count();

   int CCount = session.Query<Movies>()
                   .Where(x => x.Status == "Released")                                              
                   .Count();

   int DCount = session.Query<Promotions>()
                    .Count();

When I execute this then ACount and BCount get their values immediately on the first run). However CCount and DCount do not get their values until after three or four runs. They show 0 (zero) value in the first few runs.

Why does this happen for bottom two and not top two queries? If its because of stale results (or indexes) then how can I modify my queries to get the accurate results every time, when I run it first time. Thank you for help.

Answer 1

If you haven’t defined an index for the Movies query, Raven will create a Dynamic Index. If you use the query repeatedly the index will be automatically persisted. Otherwise Raven will discard it and that may explain why you’re getting 0 results during the first few runs.

You can also instruct Raven to wait for the indexing process to ensure that you’ll always get the most accurate results (even though this might not be a good idea as it will slow your queries) by using the WaitForNonStaleResults instruction:

session.Query<Movies>()
.Customize(x => x.WaitForNonStaleResults())
.Where(x => x.Status == "Released")                                              
.Count();