How can I create a new DB with Oracle XE ?

Hi
I'm a newbie with XE. I'd like to migrate an MS SQL Server DB to XE. How do I go about it ?
Thanks for help.
Bernard

CREATE USER ...
GRANT CREATE TABLE TO USER
In many ways, Sybase (and therefore it's derivative SQL Server) use the term 'database' in a similar way to Oracle's 'schema'. Ninety-nine times out of a hundred, when a person wants to migrate from SQL Server to Oracle and asks this question, they will be happy simply to create a schema.
In Oracle terms, a schema is a named collection of database objects (tables, indexes, stored procedures, etc.). The confusing part is that the 'name' is simply the Oracle user that is designated the owner (or adminstrator) of that collection.
So, all you need to do is create a user designated to own the collection; give that user the privileges to create the object; start creating the objects; grant permission to other users to access those objects.
The most painful difference for a Microsoft specialist is the 'granting permission to access'. Oracle takes the 'unix' view of security - provide minimum access and explicitly grant as required, whereas Microsoft products (or at least typical Microsoft product administrators) by default tend to use the 'grant access and use restrictions when required' approach.
Oracle's approach to access and security seems to 'create roles, grant them appropriate access, assign users to those roles'. The benefit is accountability. The drawback is extra administration.

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