Introduction: Reinstating an old primary database after a failover involves transforming the old primary which may have been disabled or fallen out of sync, into a working standby database again. This process, often performed using Flashback Database or managed through DGMGRL, enables it to realign with the new primary without requiring a full database rebuild. In this article, we will Reinstate old primary database after the failover. Methods to reinstate: Using Flashback Database. Using Data Guard Broker (DGMGRL). Prerequisites: Flashback Database must be enabled on the old primary. Flashback logs must be available covering the failover point. Standby redo log should exist. Old Primary must not be opened in R/W after failover. DG broker should be configured (for DGMGRL method). Environment: Source Database Hostname oradbdc.oraeasy.com SID oradbdc Database Vers...