With Terracotta, it's all possible. We can get a response time of 5 ms for a online exam application under high load of 20,000 users. We have used best technologies and are able to get 5 ms response time and reduce the load on database.
The key fact to make it happen is to keep all the intermediate data in the memory and we have memory of 16 JVM clustered using Terracotta to use.
No need of slow access database to cluster the session data. Get more inside of it from
http://www.terracotta.org/web/display/orgsite/Web+App+Reference+ImplementationExaminator is live!!!
http://reference.terracotta.org/examinator
The sources are available to download.
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