Need Best Practice - Apex, multiple schemas, security model

We have an oracle database which contains
a) named database users with no objects
b) several schemas with data tables:
sales
marketing
accounting
We need to build GUI for tables in these schemas,
every database users should belong to a group, each user group should have access to several (not all) GUI pages.
1) Is it possible and is it recommended (if not - why?) to create ONE workspace and ONE application inside it to have access to ALL tables in ALL schemas listed with user groups level security?
How to do it properly?
Some link to documentation?
2) Which security model (apex users, database users,..) to choose and why? please recommend some links to comparison...

Hi Marcus,
Our developers like to see all the tables for a single custom application in its own diagram no matter where they come from and the DBA's don't want to wade through several thousand tables to find the handful we need nor have to duplicate table definitions in multiple models. In >Designer we have been doing that with Application Folders.There are no application folders in data Modeler. You can use subviews to define your subject areas. Subview is crated for each application (folder) during import form Designer repository.
Philip

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Hi Steve,
Might be trying for solution for a long time, If i understood your question clear let me clarify you few points.
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