Singl/Multiple Server Oracle 10g DB and AS- Advantages and DisAdvantages

Hi Friends,
I am using Application1 using Oracle 10g Application Server and Oracle 10g database.
Now i planned to use Application2 using Oracle 10g AS and Oracle 10g DB
I need to know what will be the Advantages and Disadvantages if i have the schema for Application2 in the existing Oracle 10g DB / having it in another Oracle 10g DB Server
sameway what will be the advantages and disadvantages if i have the Application2 regsiterd in existing Oracle 10g AS(Multiple OC4J Instance) / having it in another Oracle 10g AS Server.
Regards

To start the list, for me some of the advantages are:
Same DB:
- less overhead and wasted CPU Cycles (therefore potentially lower license fees)
- easier maintenance (backup, recovery)
- easier tuning (fewer conflicting external environments asking for same resources)
- Oracle is designed for this, allows use of Resource Manager
- technically RAC is a clustered 'same DB'
Same AS:
- less overhead and wasted CPU Cycles (therefore potentially lower license fees)
- easier maintenance (backup, recovery)
- easier tuning (fewer conflicting external environments asking for same resources)
- Oracle is designed for this, use AS clustering
Different DB:
- separate maintenance (patch, upgrade) cycles for different SLA
- easier tuning (isolate tuning to one app)
- easier security (most developers have no idea about Oracle security and make merge impossible)
Different AS:
- separate maintenance (patch, upgrade) cycles for different SLA
- easier tuning (isolate tuning to one app)
- easier security (most developers have no idea about security)

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