Hi All,

We are investigating the suitability of using JBossCache with Berkley DB JE for 
our application. 

We have come across a strange behaviour when JBossCache persists data items to 
BDB JE:

When multiple instances of a class are inserted in cache as multiple data items 
in a single node of JBoss TreeCache, i.e. under the same FQN - the size of the 
BDB varies significantly as compared to when the same no of multiple instances 
are inserted in cache in separate nodes of TreeCache, i.e. under different FQNs 

The difference in BDB file size is in the order of 50X. The multiple node with 
single data item each results in much much smaller BDB file. The single node 
with multiple data items results in 50 times bigger BDB file.

To rule out the problem from the BDB size, I performed the same test as above 
by directly inserting objects in BDB (instead of using BDB as a cache 
persistence layer). From BDB's perspective having a single data entry vs having 
multiple data entries does not make any difference to the size of the jdb file. 
It is the same in both cases.

We would very much appreciate any help in understanding this behaviour of 
JBossCache and also to understand the recommended approach for caching. 

Thanks in advance, 
Best Regards,
Ritu Kedia




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