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If you are using space-optimized snapshots to clone an Oracle database in a VCS cluster, ensure the following before a switchover:
If you are using volume agents, unmount and destroy the clone, and then disable the cache object. After the switchover, you can take a snapshot of the database and recreate the clone database.
If you do not want to destroy the clone and then recreate it, remove volume agents for database volumes, if there are any. Use diskgroup and mount agents instead.