Database Cloning

Planning to Clone or Duplicate a Database by Shahid link

Generic Cloning
Database Cloning using Oracle Sun ZFS Storage Appliance and Oracle Data Guard link
Cloning a DB on Same Server Using Snapshot and Volume Copy link
EM12c DBaaS Snap Clone Overview link

Exadata Related
RMAN Duplicate Topics
RMAN Duplicate UNTIL TIME Blog Post link
DB Backup and Recovery Users Guide - Duplicating a Database link

RMAN Example Scripts (Shell and otherwise
RMAN RAC Duplicate Database Script by OraMatt link