フリー問題

問題文

A configuration must lose no committed transaction if the primary site is destroyed while at least one standby remains synchronized. Which transport behavior does that requirement impose on the destination?

選択肢

1. The commit waits until the checkpoint has advanced past the redo of that transaction so the change exists in the data files before the session is told
2. The commit waits until the standby has acknowledged the redo of that transaction so the change exists at the remote site before the session is told it is done
3. The commit waits until the archiver has written the redo of that transaction so the change exists in a local archive before the session is told it is done
4. The commit waits until the apply process has replayed the redo of that transaction so the change exists in the remote data files before the session is told