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InProc Session states & IIS Recycling

Posted on 2011-10-04
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Last Modified: 2012-05-12
Hi All,

I have developed a web application which relies on Session states to authenticate approx 20 users.

In IIS7, could you confirm that whether the Recycling - > Regular Time Interval will actually kill all sessions states?

If it does then if I was to configure this setting to 0, what are the implications?

Thanks,

Rit
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Question by:rito1
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Rovastar earned 2000 total points
ID: 36911346
Recycling the app pool will destroy the session for InProc.

More info here:
http://blogs.msdn.com/b/webtopics/archive/2009/07/22/in-proc-session-state-management.aspx


In theory you can have not recycle your app pool (set to 0). Recycling cleans up and tidies anything in the app could generate, memory leak, etc

There are 2 schools of thought in the IIS admin world

a) Recycle the app pools daily. Off peak. (default every 29 hours which will recycle in peak hours sometimes - that is silly) Keeps everything in tip top form daily.

b) Never recycle app pools. The devs should have perfect working code and if it is not working perfectly that we fix it.

Personally I am in the a) camp.

All that said app pools could recycle for other reasons than a scheduled restart. An actual probelm with something you want to automatically recover.

In this case you might want to still keep you session information.
If you need persistent session management than store you session in a persistent state. State Server or SQL server rather than In Process. There is no real need to have inProc for these cases and the benefits out way the drawbacks.
Also if you scale to a farm you should look at this option more so.
Hope that helps.
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by:rito1
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Thanks Rovastar, that is a great response.

I am going to implement Cookies to give me reassurance on this occassion.

Thanks,

Rit
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