What is 2nd level cache?

We have to use Telerik ORM for our project. As 开发者_如何学编程i was reading its features it boasts too much about its 2nd level cache feature. Can anybody explain me what is it?

Thanks in advance:)

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It's the ability to cache the data of the result of a query outside of the DataContext/UoW/Session (what ever telerik decided to call it). So any queries after the initial one will return cached data.

Same as using the application cache or memcache etc.

Edit:

A google for "Telerik Second Level Cache" returned:

http://www.telerik.com/help/openaccess-orm/2nd-level-cache.html

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If it's anything like NHibernate's 2nd level cache it means query caching.