system and sysaux tablespaces

* system, sysaux table spaces are mandatory tablespaces the are created at the time of database creation.

they must be online

* SYSTEM tablespace is used for core functionality (dictionary tables)

* the auxiliary SYSAUX tablespace is used for additonal database components ( such as the enterprise manager repository)

* the system and sysaux tablespaces are not recommended to be used to store application's data.