Diffrentiating First and Second Level caching in Hibernate?

[vijin das]

What is First and Second Level caching in Hibernate?
why caching is important in hibernates senario ...??
need explanation ???

[Paul Sturrock]

The first level cache is implicit in the Session. The second level cache is configurable declaratively and requires a third party implementation (such as EHCache).

Caching is important in any database backed application to prevent huge numbers of round trips to the database. This tends to be the bottle neck in database applications.

The documentation covers this in more detail.

[Pradeep bhatt]

Hi Paul,

Does 2nd level caching detect changes made to db from another application ? Does it refresh ?

Thanks,Pradeep

[Paul Sturrock]

No.