Question about users

Hello,
after installing oracle database ii saw that there are numerous default users (for example: DMSYS, HR, IX, CTXSYS, WMSYS, XDB, and so on..). if i don't need these users can i delete them? or what's the sense having those users? what they are for? i wanna have just those users i need, so for example i have an organization and i created a user for each employee. i don't need all other users
Please clarify me..
Regards,

Roger22,
Every username ending in SYS owns the repository for an Oracle provided facility.
DMSYS is for datamining, CTXSYS is for Oracle Text, WMSYS is for Workspace Manager, etc.
Apart from the fact you can not 'delete users', there is a DROP USER ... CASCADE statement,
these facilities have their own de-installation procedure, which you can run by starting up dbca and choose for 'Edit Database' and disable the appropiate question.
The nature of your question betrays you seem to plan to abuse this forum as a free documentation abstraction service.
Could you please refer to http://tahiti.oracle.com first, this will resolve your questions quicker, and you will actually learn something.
Sybrand Bakker
Senior Oracle DBA
Experts: those who did read documentation.

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