You can use the dbed_ckptumountcommand to unmount a Storage Checkpoint from the command line.
Before unmounting Storage Checkpoints, the following conditions must be met:
Prerequisites
You must be logged on as the database administrator (typically, the user ID oracle.)
Usage notes
See the dbed_ckptumount(1M) manual page for more information.
To unmount Storage Checkpoints
Use the dbed_ckptumount command as follows:
$ /opt/VRTS/bin/dbed_ckptumount -S PROD \ -c Checkpoint_971672042_wr001