Hi,

I have a Hibernate application that has an Entity with 3 properties (two strings, one integer) and an Id. When I persist and cache an object of this entity and call cache.calculateInMemorySize(), I'm told by Ehcache that this object is using more than 1kbs in Ram. Caching 100k (100,000) objects uses up more than 100mbs according to cache.calculateInMemorySize().

Is this an expected behaviour with Hibernate + Ehcache?
Is the amount of RAM been used justifiable?

An application that demonstrates the situation is posted at the link below, any insight will be much appreciated.

http://forums.terracotta.org/forums/posts/list/5687.page

Hibernate: 3.4.0.GA
Ehcache: 2.4.3

Thanks,
Yinka.

Putting the same entity directly in the cache gives the numbers below

1 Entity - 508bytes
100K Entities - 49mb

Which is about half of what is used when hibernate handles the caching.

Please can someone that understands explain the rational for the extra memory consumption.

Thanks,
Yinka.

Hello Everyone, I am adding the objects into ehcache with session.createQuery.list() using hibernate, and have the cache size of 50000(maxelementsInMemory) and 2,00,000 records in DB (postgreSQL),
it occupies 65 MB of Memory(In Hibernate statistics), so, please give me any option to optimize the memory occupied by it ??

How to add the detached objects into ehcache ???

Waiting for your reply thanks.