If you have a problem with your primary site and can't access your primary database, you can continue working with the database that you have as standby on the other site, by changing its role to primary.
Oracle Data Guard offers robust data protection with real-time replication, flashback features, and high availability across multiple data centers. Users appreciate its stability, near-zero data loss, and efficient disaster recovery testing. While scalable, it has challenges such as complex setup, high pricing, and communication link issues. Despite these, it ensures data integrity for critical operations, although there might be microsecond data loss during network disruptions.
