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PONHibernate: Criteria query slow in web app but fast in unit tests, why?
 

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  1. PONHibernate: Criteria query slow in web app but fast in unit tests, why?
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    <p>I am having a problem where a criteria query in NHibernate is executes in less then a second when I run it in a unit test, but when I try to run it from the context of my web application, it takes over a minute. Both are hitting the same database for the same data.</p> <p>My NHibernate mapping:</p> <pre><code>var properties = new Dictionary&lt;string, string&gt;(); var configuration = new Configuration(); properties.Add("connection.provider", "NHibernate.Connection.DriverConnectionProvider"); properties.Add("proxyfactory.factory_class", "NHibernate.Bytecode.DefaultProxyFactoryFactory, NHibernate"); properties.Add("connection.release_mode", "on_close"); properties.Add("current_session_context_class", "web"); properties.Add("dialect", "NHibernate.Dialect.MsSql2005Dialect"); properties.Add("connection.connection_string_name", "DBConnection"); configuration.Properties = properties; SessionFactory = configuration.BuildSessionFactory(); </code></pre> <p>The only difference in this mapping between tests and the web app is the current_session_context_class, where it is thread_static in tests, but that does not seem to be the problem.</p> <p>The criteria for the query:</p> <pre><code>var reports = Session.CreateCriteria&lt;Report&gt;() .SetFetchMode("Site", FetchMode.Join) .SetFetchMode("Actions", FetchMode.Join) .SetResultTransformer(new DistinctRootEntityResultTransformer()) .Add(Subqueries.PropertyIn("Site", SiteCriteria.GetSitesForUserWithPermission(user, Permission.SomePermission)))) .List&lt;Report&gt;(); </code></pre> <p>I have tried using NH Profiler to help, but it did not offer any useful suggestions.</p> <p>edit: Looking further in nhprofiler, I see that in the test for example, the query duration is 1ms / 313ms (Database only / Total). But for the website it just took me 1ms / 43698ms. It seems that NHibernate is having a hard time mapping the actual objects.</p>
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    1. COHow you create session in your Web application?
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    2. COWe have a HttpModule that creates and builds/disposes of the session on each request.
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