Entity

Question

1.What is Strong and weak entiry and difference between them?
2. What is Hierarchy and difference between Internal and External hierarchies?
3. What is Normalization and Denormalization?
4.What is Database Consistuency?
5.What is OLAP and Difference between MOLAP and ROLAP?
6. What is reference Integrity?
Please search the forum before posting thread. Or You can just google all these things
Edited by: Pravender on Sep 15, 2010 12:52 PM

Answer 1

For read-write entity bean, the stub is not a replica-aware stub, so all the
          calls goes to the same bean instance. If server goes down, we should use
          home stub to find a new instance again.
          For read-only entity bean, the stub is replica-aware stub, so the calls will
          be load balanced, that means the subseauent call may goes to another server.
          If the server goes down, there will be fail over.
          For another case, if your entity's client, for example a session bean,
          reside on the same server as the entity bean, then all the calls will go to
          the same server. This is the optimization of WLS.
          Wenji
          "Dave" <[email protected]> wrote in message
          news:[email protected]..
          >
          > Hi! I've got one more question: If I have a remote interface to an entity
          bean
          > that was created or found on a particular server in a cluster, will all
          subsequent
          > calls on a remote stub be directed to that same server where the actual
          instance
          > is? What will happen if the server goes down???
          >
          > Thank you very much.