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Don - Your answer depends on various unknowns:
But as a rule (standard) it is best practice to always pre-fix your object with the schema it belongs to (as in your options (3)).
If you want to avoid database links then you'd want to keep the tables within the same instance. But, seperate instances mean easier maintenace for DBA purposes as they can be administered seperately and DB parameters can be set independantly for different application that may have completely different characteristics ie. on-line real-time vs. batch over-night processes.
If you wanted to easily differentiate between your own 'application' and client 'applications', then a prefix on object names seems a reasonable rule, as it makes the objects immediatelly identifiable.
Regards
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apply.
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Received on Mon Aug 18 1997 - 00:00:00 CDT