Issuing a checkpoint statement while AMPs are offline is permissible. If AMPs are offline when a checkpoint is issued, Teradata ARC automatically generates a system log entry that takes the checkpoint on the offline AMPs as soon as they return to online status. The system startup process generates the checkpoint and requires no further action.
In addition to generating the checkpoint entry in the journal, system recovery updates the journal table with change images that were generated while the AMP was offline. These change images are for fallback tables or dual image journals that should be on the AMP that was offline when the system took the checkpoint.