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Be very careful since-deleted objects cannot be reverted back. |
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Perform such import during off-peak hours. You can enable the 'System Lockdown' feature to stop other users from logging into the system.
Delete objects which have many dependent obects objects can take a long time.
The database locks the tables from which the data is being deleted. Set the pre-validate to a small number 100 or 200 to ensure the locks are not held for a long time.