問題文
A major release upgrade must keep the application available for all but a few minutes. The team considers the rolling method that uses SQL apply. Why does that method shorten the outage?
選択肢
- One member is upgraded and kept in step through block changes while the other still serves the application so only a role change is visible
- One member is upgraded and kept in step through backups while the other still serves the application so only a role change is visible
- One member is upgraded and kept in step through exports while the other still handles the application so only a role change is visible
- One member is upgraded and kept in step through statements while the other still serves the application so only a role change is visible