What Are the Predefined Tablespaces in a Database?

When you create a new database, Oracle server will create 4 required tablespaces for the new
database:
SYSTEM Tablespace - Every Oracle database contains a tablespace named SYSTEM, which
Oracle creates automatically when the database is created. The SYSTEM tablespace is always
online when the database is open.
SYSAUX Tablespace - The SYSAUX tablespace was installed as an auxiliary tablespace to the
SYSTEM tablespace when you created your database. Some database components that formerly
created and used separate tablespaces now occupy the SYSAUX tablespace.
UNDO Tablespace - UNDO tablespaces are special tablespaces used solely for storing undo
information. You cannot create any other segment types (for example, tables or indexes) in undo
tablespaces. Each database contains zero or more undo tablespaces. In automatic undo
management mode, each Oracle instance is assigned one (and only one) undo tablespace. Undo
data is managed within an undo tablespace using undo segments that are automatically created
and maintained by Oracle.
TEMP Tablespace - When the SYSTEM tablespace is locally managed, you must define at least
one default temporary tablespace when creating a database. A locally managed SYSTEM
tablespace cannot be used for default temporary storage.