When it is necessary to resist regional disasters, users can use the cross-G i On...

Database primary/standby synchronization can be achieved by using database native technology or third-party tools B. The disaster recovery center cannot be started when a disaster does not occur, which can save costs

The main system and disaster recovery system can be deployed in different cities

D. When the disaster does not occur, the user imports 50% of the traffic into the production center and 50% of the traffic into the disaster recovery center to Answer: D