What is schema?
Schema is a collection of schema objects.Schema objects are nothing but a collection of logical structures of dataA schema is owned by a database user and has the same name as that user.
Each user owns a single schema.

The data of each schema object is physically contained in one or more of the tablespace’s datafiles.
Here one thing to remember that a tablespace can contain objects from different schemas.
There is no relationship between schema and tablespaces.

Using SQL we can create and manipulate Schema objects.
Schema object can be any of the following types ,

• Clusters,Database links,Dimensions

Database objects like Roles,Tablespaces,Usersetc are not contained in a schema.

Also Read,

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• Oracle Tablespace, and Datafiles – Introduction
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