Oracle Data Guard
Oracle Data Guard Oracle Data Guard Oracle Data Guard is Oracle’s solution for high availability, data protection, and disaster recovery for enterprise databases. It creates and maintains one or more standby databases as transactionally consistent copies of a primary database. If the primary database becomes unavailable due to planned maintenance or unplanned outage, Data Guard can quickly switch a standby into the primary role, minimizing downtime. Data Guard services: Redo Transport Services and Apply Services , which handle shipping of redo logs and applying changes to standbys, as well as Role Transition services to switch roles between primary and standby. Redo Transport Services Control how redo is sent from primary to standbys (synchronously or asynchronously, how it’s buffered, etc.). Transport services also handle networking faults by queuing redo and resolving gaps if a standby missed some logs (e.g., netw...