Take for example a dataset, this will normally be serialized with the binary formatter (unless you don’t create your own dataset surrogate) into an XML format. Lots of data in out of proc session state may not only cause your performance to suffer, but depending on what you store in session scope you may be suffering a memory hit there too. One thing that may not be readily apparent is that if you use either of the out of process storage locations you will be reading in and de-serializing all the session data for a particular user on each web request. For state server and SQL server you have the performance cost of serializing and de-serializing the session data. There are of course pros and cons of each but no matter which one you use, you should be careful with how much you store in session state if you want your application to be scalable.įor in-proc session state, storing too much in session means high memory usage. In proc which stores session variables in the cache, State server which stores it in the state service and finally SQL Server. In ASP.NET 1.1 as you probably know, there are 3 different locations to store session objects. Tags: Memory Leak Case Study: Sessions Sessions Sessions It was imported from my old blog using an automated tool and may contain formatting errors and/or broken images.
#DEFINE SESSION IN ASP.NET UPDATE#
UPDATE : Also check out my blog post on Session State Partitioning using load balancing!
From now on, ASP.NET will use the class specified in the partitionResolverType attribute for distributing sessions across state servers. You may have noticed that the stateConnectionString attribute was replaced by a partitionResolverType attribute.
In order for ASP.NET to use our custom class, modify web.config into: Most probably, you'll have a web.config which looks like this: The ResolvePartition method is called with the current session id in it, and allows you to return the connection string that should be used for that specific session id. Public class PartitionResolver : īasically, you just have to implement the interface, which is the contract ASP.NET uses to determine the session state server's connection string. The "magic" of this el-cheapo solution to multiple session servers will be your own session state partitioning class. Create your own session state partitioning class Set up ASP.NET session modeįollow all steps in my previous blog post to set up the ASP.NET state service / SQL state server database and the necessary web.config setup.
#DEFINE SESSION IN ASP.NET DOWNLOAD#
Want an instant example? Download it here: SessionPartitioning.zip (2.70 kb) Want to know what's behind all this? Please, continue reading.
In short, partitioning provides a means to divide session information on multiple session state servers, which all handle "their" part of the total amount of sessions. A cheaper way is to implement a custom partitioning algorithm which redirects session X to state server A and session Y to state server B. When scaling out an ASP.NET application's session state to a dedicated session server (SQL server or the ASP.NET state server), you might encounter a new problem: what if this dedicated session server can't cope with a large amount of sessions? One option might be to create a SQL server cluster for storing session state.
Since this is a little known feature of ASP.NET, here's a little background and a short how-to. ASP.NET Session State Partitioning JanuEdit on GitHubĪfter my previous blog post on ASP.NET Session State, someone asked me if I knew anything about ASP.NET Session State Partitioning.
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