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BOOK: ASP.NET 2.0 Website Programming Problem Design Solution ISBN: 978-0-7645-8464-0
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Old July 1st, 2007, 05:34 PM
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Default Cache Mechanism in Different IIS / FE - BO

Hello ALl,
I've found the cache mechanism in this book quite good but can someone tell me if it could work on different IIS. I Have 2 IIS, one for the BackOffice Admin and other for the Site. Imagine i update some article in BackOffice ... normally it will purge this item ID from cache. How would the FrontEnd that it's on another IIS will know that the item was purged from cache so it my be able to get the newest item version ?
Tks a lot for any feedback.
Pedro Bernardo
http://www.inbox.pt

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Old July 1st, 2007, 10:08 PM
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You could use ADO.NET SQL cache dependencies. That can keep the 2 servers in sync. It's a pain to set it up, so I'd advise you to make sure you really need 2 servers. I always try to avoid 2 servers unless they're set up in a farm configuration for load balancing.

Eric

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Old July 2nd, 2007, 05:12 AM
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Indeed, i'm using a WEBFarm for the FrontEnd Site with 2 WebServers and i have the backoffice on another Network only available to the local users and using another WebServer. They both use the same DB.
So Eric let me just clarify things here
1. The Cache Configuration used in this book doesn't fit in this scenario
2. The cache mechanism to use in this kind of scenario is the ADO.NET SQL cache dependencies
Correct ?
(I really like that Purge based cache mechanism..)
Pedro Bernardo
http://www.inbox.pt

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Old July 5th, 2007, 01:08 AM
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Right on both counts. That's a messy setup that will take a lot of work to make it bullet-proof. I really think you should have only 1 farm and use security profiles to control backoffice access as needed.

Why do you need a whole different server for the back office? Can't you open port 80 and 443 between these network zones? Most companies do. A simple Ethernet switch or router can save a ton of coding work. Maybe you already have a switch or router that just needs to be configured?

Eric

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Old July 10th, 2007, 06:24 AM
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Imagine i pass the Backoffice to the Farm where the FrontEnd Site is. I would still have the problem with the caches because i would still have 2 webservers in the farm ? Right ? ...or maybe not...

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Old July 10th, 2007, 11:36 PM
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There's nothing wrong with 2 webservers as long as they are set up in a farm configuration. They can share the same DB with a short-term cache. It's understood that the other webserver might have old data for a few seconds after an update. Unless this is used for financial or e-commerce it shouldn't matter much. Servers in a farm need to be configured identically and need to use out of process session state, normally via the Windows state service.

Eric

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Old August 3rd, 2007, 01:05 PM
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Ok Eric Tks,
Tell me one more thing. We are using a count mecanism in the articles where we can see which article as been more viewed. If we use the cache mechanism how can we know for sure how many views has a specific article if most of the times is the cache iis mecanism that responds to the client.
Tks again
PB

 


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