ASP.NET Caching FAQS

ASP.NET Caching FAQS Page 2

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11. What is Sliding Expiration and absolute Expiration in asp.Net Caching?
Sliding Expiration: With sliding expiration, ASP.NET waits for a set period of inactivity to dispose of a neglected cache item. Ex: Cache.Insert("MyItem",obj,null,DateTime.MaxValue, TimeSpan.FromMinutes(10)) --> The cached data will be removed only if it is not used within a ten-minute period. Absolute Expiration: With absolute expiration, we set a specific date and time when the cached item will be removed. Here’s an example that stores an item for exactly 60 minutes: Cache.Insert("MyItem",obj,null,DateTime.Now.AddMinutes(60), TimeSpan.Zero)
12. What are different types of Cache Dependency in .Net?
Two types of cache dependency available in .Net 1.File and Cache Item Dependency :- Cache item can be dependent on a particular file. On modification of this file, cache will be invalidated. 2.Dependencies on a database query :- cache items can be depenedent on sql queries as well, any changes to sql data, cache will be invalidated.
13. How can you implement File and Cache Item Dependency?
File and Cache Item Dependency
14. How can you implement Cache dependencies on a database query?
Dependencies on a database query
15. What HTTP module asp.net used for caching?
The OutputCacheModule Caching in Asp.Net is implemented as an HttpModule that listens to all HttpRequests that come through the ASP.NET worker process.
16. What is the difference between Cache and Application variable?
The scope of both variables are in Application level. Cache variable provide cache specific features (i.e. expiration). Cache data depends on cache memory, If server running very low cache memory it will remove cached items based on priority.
17. What is the difference between Cache variable and Session variable?
The scope of the Cache variable is Application level, sessions variable can be accessed with in session. Cache variable provide cache specific features (i.e. expiration). Cache data depends on cache memory, If server running very low cache memory it will remove cached items based on priority.
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