What is sliding expiration in asp net?

Sliding expiration resets the expiration time for a valid authentication cookie if a request is made and more than half of the timeout interval has elapsed. If the cookie expires, the user must re-authenticate.

What is true about sliding expiration when used in the context of in-memory caching?

The cached DateTime value remains in the cache while there are requests within the timeout period. A cached item set with a sliding expiration only is at risk of becoming stale. If it’s accessed more frequently than the sliding expiration interval, the item will never expire.

What is SlidingExpiration and absolute expiration in caching?

SlidingExpiration will expire the entry if it hasn’t been accessed in a set amount of time. The ObjectCache Add() overload you’re using treats it as an absolute expiration, which means it’ll expire after 1 day, regardless of how many times you access it.

What is absolute cache expiration in asp net?

In the absolute expiration you can see that it will expires after one minute whether its accessed or not. While in sliding expiration it will expire cache if cache is not accessed within specified time like one minute.

How does sliding expiration work in a cache?

There are two types of cache policies you can use: CacheItemPolicy.AbsoluteExpiration will expire the entry after a set amount of time. CacheItemPolicy.SlidingExpiration will expire the entry if it hasn’t been accessed in a set amount of time.

When does an item in the cache never expire?

If it’s accessed more frequently than the sliding expiration interval, the item will never expire. Combine a sliding expiration with an absolute expiration to guarantee that the item expires once its absolute expiration time passes.

What does sliding expiration mean in ASP.NET?

Sliding expiration means a cached item will be removed it is remains idle (not accessed) for a certain amount of time. To set either of these expiration policies on a cached item you use MemoryCacheEntryOptions object.

What’s the difference between expiration and sliding expiration?

For Absolute expiration, if you wish to expire the cache 30 minutes (for example) into the future. Then you will have to create a new CacheItemPolicy for each cacheitem (Whereas with Sliding Expiration you can just define one). As the actual time for the expiration has to be set each time.