Having trouble mapping multiple Informix databases to Oracle

Hello,
I am new to Oracle, so please forgive any misuse of Oracle terminology.
I have several dozen Informix 7.31 databases to migrate to Oracle.
We host more than one database per Informix server instance.
Each of these databases have the same schema definition and are usually created by the same user. So, since the table names and owner names are the same for more than one database, the database name itself is the only unique value.
When I attempt to use the Migration Workbench, the database name is lost. The Oracle model created seems to be merging several Informix databases into a single Oracle database (or schema).
A very brief example involving 2 tables;
Informix Source: Database: alf owner: padb table: device_config
Database: firstlast owner: padb table: device_config
Oracle Model: Database: padb User: padb
Table: device_config and device_config_1
I thought I might be able to modify the Informix source database so that the owner name was the same as the database name. That is not always possible because Informix has a limit of 8 characters for user names and many of the Informix database names are longer than that.
This will not work at all. I really don't want to set up separate database server instance for each schema. I found the following statement in one of the Oracle manuals:
"A schema is owned by a database user and has the same name as that user. Each user owns a single schema."
Please help me figure out how to do this.

Do you want to keep all of these Informix databases seperate?Yes, if I understand the question correctly. If this is a question about disk amangement, I am not very concerned with that at this point. I plan to worry about optimizing IO later.
Are all of these databases the same or different? e.g. is the definition of device_config the same for all databases?All the databases have the exact same schema definitions.
Do you need more than one instance of Oracle? e.g. dev / qa / production?There will be more than one instance, but that is based on region and load. Eventually there will be servers deployed throuout the world and serveral sites. Some sites have more than one server, others only have one.
You are correct that I have a lot more reading to do.
The application that uses these databases currently works like this;
1) A DSN Data Source is selected from a list. (it is assumed that each DSN is a separare instance)
2) A connection is opened and a list of databases/schemas is queried from the system catalog.
3) The user selects the database to work with.
Thanks for your help,
Rob

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Message was edited by:
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