フリー問題

問題文

A replication topology has to allow an automatic change of the source when the current one fails, without an external tool. Which identification scheme is required?

選択肢

1. That automation requires the general tablespaces that every participating server unfortunately has to enable.
2. That automation requires the scheduled events that every participating server unfortunately has to enable.
3. That automation requires the recovery credentials that every participating server unfortunately has to enable.
4. That automation requires the global identifiers that every participating server unfortunately has to enable.