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why we need Caching

 
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Hi All,
Thanks a lot in advance.
I have searched so many sites from google on cache but could not found anything good.
Could any one please provide me the links of various sites which will tells why caching is required in web sites and in which kind of situations we can use cache and there limitations of usage.

Regards
Sree
 
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Are you referring specifically to the caching that is available in WebSphere (e.g. the Dynacache facility) or are you talking about caching in general?

Why are you asking this question? If I can understand that, then I can help tailor a more appropriate answer.
 
sreedhar Lackka
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Thanks a lot for your reply.
First of all I want to know why we need a cache in general. I want a good document on this topic.Why we need a cache and where we can implement. At high level we can say this is to achieve performance.But want in detail.

Regards,
Sree
 
Kyle Brown
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Oh boy, well, the reason it's probably so hard to find is that this is a pretty basic computer science technique. You use a cache anywhere where you need to trade memory for processing speed -- in other words, if you have an operation that will be repeated several times, and each time you perform that operation it takes 100 milliseconds, then if you can instead fetch the result from memory (e.g. a cache) in only 1 millisecond, then it makes sense that you would use a cache in front of the code that performs that operation.

There's a very basic explanation of caching at http://computer.howstuffworks.com/cache.htm but I doubt it's a the level you want (but I may be wrong). What I'm interested in is why you want a cache in WebSphere. What is leading you to ask this question in this forum? Tell me the problem you are facing and I can help you understand if WebSphere's caching technologies may help.
 
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