If you have a web farm and you are using ASP.NET session State server or SQL Server for storing sessions then you can face the following issues.
Single point of failure (data loss)
In the case of Session State Server, all the function are performed on a single node. In other words, the whole web farm is dependent upon a single node and if that node goes down, the whole web farm will go down. it may leads to single point of failure.
Slow performance on peak loads
As all the operations are being performed on a single node, it may results in performance issue during the peak load time. When there are numbers of requests at the same, it may choked up which will not only effects it performance but also ultimately the whole node will go down, which means the complete data lose.
Scalability issues due to database bottlenecks
As Session State Server is a database driven application, database may become a bottleneck when its size will exceed from a certain limit. For every request, session state server has to make a trip to the database which can cause the scalability issues.
In situations like these,you should move to a distributed caching solution like NCache so that you can improve your application performance and remove the limitations of Session State Server.
With NCache you can enable the distributed caching without changing your application code. You can plug-in the cache with a web.config change. NCache provides couple of topologies which are optimized for different types of applications. There is a powerful dynamic clustering feature which lets you add/remove cache servers at runtime without stopping your application.
client-optimization – Based on Hasing alog the client makes intelligent decisions for storing and finding the data. It directly talks to the server where the data is stored and in a single call it fetches the data and gives linear scalability as you add more servers to your cache cluster. For read intensive applications the performance can be boost further with the help of client cache because it reduces the network trips for fetching the data from the remote cache.
Alachisoft, is located in San Francisco Bay Area, California, is a leading provider of NCache and StorageEdge. NCache is a high performance in-memory object caching solution for mission critical .NET and Java applications with real-time data access needs. While StorageEdge optimizes SharePoint storage and performance. It externalizes all BLOBs from SharePoint content database and reduces the database size by 95%.