Using more than one PU and PC for the same database

Question

I have a scenario described here: [http://www.seamframework.org/Community/UsingTwoParallelNestedConversationsWithParentAtomicConversation|http://www.seamframework.org/Community/UsingTwoParallelNestedConversationsWithParentAtomicConversation]
which uses Seam, EJB3, JPA, Hibernate, Richfaces (modalPanel) and JSF.
The question I have is the following:
is there any negative consequence (memory consumption, performance hit, etc.) of using more than one persistence unit in the persistence.xml that points to the same EntityManagerFactory? I was thinking of having one PersistenceContext (Seam-managed PC - an extended PC which is conversation-scoped) which uses one PU and reserving the other PC for the modalPanel forms and backing beans (SFSBs).
The reason I needed to use this solution/approach is so that when using Hibernate MANUAL flush with SMPC, I can achieve isolated synchronization of the PersistenceContext without updating values in the modalPanel forms and vice versa.
Any tips on best practices or alternative solutions? thx.
persistence.xml snippet:
   <persistence-unit name="boBETS">
      <provider>org.hibernate.ejb.HibernatePersistence</provider>
      <jta-data-source>java:/boBETSDatasource</jta-data-source>
      <properties>
         <property name="hibernate.dialect" value="org.hibernate.dialect.SQLServerDialect"/>
         <!-- <property name="hibernate.hbm2ddl.auto" value="validate"/>   -->
         <property name="hibernate.show_sql" value="true"/>
         <property name="hibernate.format_sql" value="true"/>
         <property name="hibernate.generate_statistics" value="true"/>
         <property name="jboss.entity.manager.factory.jndi.name" value="java:/boBETSEntityManagerFactory"/>
         <property name="hibernate.default_catalog" value="boBETS"/>
         <property name="hibernate.default_schema" value="dbo"/>
      </properties>
   </persistence-unit>
   <!-- using boBETS2 for ListValueParamAction for now! trying to isolate the em.flush() such that we can achieve atomic conversations for the
   base form as well as the popup form! -->   
   <persistence-unit name="boBETS2">
      <provider>org.hibernate.ejb.HibernatePersistence</provider>
      <jta-data-source>java:/boBETSDatasource</jta-data-source>
      <properties>
         <property name="hibernate.dialect" value="org.hibernate.dialect.SQLServerDialect"/>
         <!-- <property name="hibernate.hbm2ddl.auto" value="validate"/>   -->
         <property name="hibernate.show_sql" value="true"/>
         <property name="hibernate.format_sql" value="true"/>
         <property name="hibernate.generate_statistics" value="true"/>
         <property name="jboss.entity.manager.factory.jndi.name" value="java:/boBETS2EntityManagerFactory"/>
         <property name="hibernate.default_catalog" value="boBETS"/>
         <property name="hibernate.default_schema" value="dbo"/>
      </properties>
   </persistence-unit>What happens if I were to have 10 PUs and 10 PCs in the same app? Whether they're all pointing to same DB or not. What's the consequence of using "too many"?

Answer 1

Yes, you can use multiple iCloud accounts in multiple User Accounts on one computer, but, as you know not multiple iTunes Match accounts. Keep in mind that the two services are not the same.
Since you've posted your question to the iTunes Match forum, which it really doesn't pertain to, you might want to also post it to the iCloud on my Mac forum.