フリー問題

問題文

A site adopts the synchronous method with the lighter acknowledgment to protect commit times and reports that it now has zero data loss under every failure. Which case breaks that claim?

選択肢

1. The standby host runs out of space in its recovery area so the redo that had arrived there was still waiting to be moved into the area
2. The standby host is restarted while the primary keeps running so the redo that had arrived there was still waiting to be archived locally
3. The primary site is destroyed at the same moment that the standby host loses power so the redo that had arrived there was still waiting to be written
4. The primary site is destroyed at the same moment that the standby host loses its network so the redo that had arrived there was still waiting to be applied