Creation of separate database

Hello friends,
I've to create a new database like production but don't know how do I proceed!
The server detail is as under:
EBS 12.1.1
Redhat Linux 64bit
Vision database
The partition detail is as under :
Filesystem     -     Size      -     Used      -     Avail      -     Use% -     Mounted on
/dev/sda5     -     15G      -     2.5G -      12G      -     18%      -     /
/dev/sda7     -     107G -      40G -     62G      -     39%      -     /PROD
/dev/sda3     -     54G -     47G      -     3.6G -     93%      -     /stage
/dev/sda2     -     262G -     232G -      17G      -     94%      -     /VISION
/dev/sda1     -     99M -     12M -     83M      -     13%      -     /boot
tmpfs          -     3.9G -     2.8M -     3.9G -      1%      -     /dev/shm
Memory details:
Total Memory : 7974
Used Memory : 7893
-/+ buffers/cache: 1773 / 6200
Swap: 16386, used: 0
SGA size:
sga_max_size: 4G
sga_target: 4G
It seems I don't have much space. Further I can't delete vision as we use it for demo purpose.
Please help.
Regards
Aneel

1) how much space will be required to create new database?Are you installing a new database or cloning an existing one?
If you are cloning, you need the same size of the source database.
If you are installing, please see http://docs.oracle.com/cd/E18727_01/doc.121/e12842/T422699i4773.htm#3708195
2) If I've space upto 450 GB and I re-install OS can I've 2 instances (Vision & Prod) then?No.
3) Can I delete some unusable tablespaces from Vision database to make some space? (sorry if it sound a foolish question - I'm newbie :P )Yes, if it is possible and you need to resize the existing tablespaces.
Thanks,
Hussein

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