Migrating Informix databases to Oracle

Hi, I am new to Oracle so apologies if this is a basic question.
I have Informix set up on a Unix system, which consists of several databases, within Informix the databases are truly relational, i.e I can perform sql queries across rwo databases at the same time.
From what I understand with Oracle, you can only have one database per instance? is this correct?

People who come from another rdbms usually have a different concept between database and schema and instance. In Oracle a database, a single database can contain multiple schemas (independent collections of objects belonging to one user). You can have as many databases per host as the host is able to handle according to its capacity. A database is open by one Oracle instance (mutiple instances can open the same database only in RAC mode).
Oracle can query remote databases by means of database links. In this case the schemas can be queried by granting proper privileges to the users.
For further introductory concepts I suggest you to read this reference:
Oracle® Database 2 Day DBA
10g Release 2 (10.2)
Part Number B14196-02
~ Madrid

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Christof Hagemann (guest) wrote:
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Informix
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