You can manually delete one or more SQL clones.
Procedure
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From the navigation pane, go to Protect > Databases.
The Instances page appears.
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Click Instant clones.
The Instant clones page appears.
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Select one or more clones that you want to delete, and then click Delete.
Alternatively, you can click a clone name, and then on the Instant clone details page, click Delete.
A delete confirmation box appears.
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Click Yes.