> The EJB server will load balance the client requests to any number of
> servers in a cluster, each one will load it's own copy of the entity
> bean, without the overhead of sharing but with the overhead of more
> database hits. At some point caching kicks in and improves
> performance.
The issue is that not all EJB appservers do replication within a cluster
of Entities. I'm reading too many product doc's, I forget who can do
what? I believe IAS 4.0 will replicate Entities who's DD declares them
to have "exclusive" access to the persistent store, meaning the bean
will not re-read if no changes. Where as if the Entity is DD declared
to be shared, all accesses will re-read the data.
Now, I belive I read that WLS 5b2 does not replicate Entities in a
cluster??? What would be important for scaling and capacity _is_ to
replicate Entities that do optimistic caching without bothering the
persistence layer and make that a DD option.
Thanks,
curt
Curt Smith
Z-Tel
email: [EMAIL PROTECTED]
work: 404-237-1166 x182
FAX: 404-237-1167
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