Database Architecture for OnDemand design

Hi All,
We have a custom application and every time for the clients we are giving all our executables and they are installing in their machines.
Rather than that we want to have 1 application installed in the server at our side and wants to give domains to all the clients to access.
So that we want to design database like following:
1)There will be only one schema,all the packages and tables will present in one schema and each client will be distinguished by a column which stores the domain of that client and the customizations should be placed in only 1 set of packages .And will have some archieve tables to remove the data from parent tables once all the transactions are completed.
2)There will be seperate schemas for tables each client and can have seperate packages for customizations
3)There will be sepearate schemas for only tables not for packages there will be only 1 set of packages.
Please advice which one will do good interms of performance and coding for the customizations.
Thanks

2)There will be seperate schemas for tables each client and can have seperate packages for customizationsThis seems like it would be the best option.
Each client should have a seperate schema and seperate packages.
You don't want multiple clients sharing the same schema.
It would also be recommended to have seperate tablespaces for each schema/user/temp per client. You don't want to run into any legal issues.
Keep in mind the following when going to Oracle OnDemand (I have been through some discussions in the past with OOD)
Once you dump your database and transfer to OOD, you'll no longer have the ability to manage the structure. Setting a good design is very important upfront especially if you want your database to be scalable. Changes being made to database design will be like pulling a tooth. Maintenance will essentially occur when they see fit, but good thing is that it will be designed as HA so any maintenance can be done in a rolling fashion.
- Wilson
[http://www.michaelwilsondba.info|http://www.michaelwilsondba.info]

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