am little confused about the cache levels in hibernate

[siri.th]

hi to all,
am confused about the cache levels in hibernate.some are saying only 2 levels and some are saying 4 levels. can anybody give answer for this. how they can be used.

[Ramanjaneyulu]

Hi Siri,
Hibernate uses two different caches for objects
1)first-level cache(also called Session cache): This cache always Associates with the Session object. Hibernate uses this cache by default.
and
2)second-level cache((also called SessionFactory cache):This cache always associates with the Session Factory object. To use this cache user needs to configure.