data guard failover steps

Conditions shown in blue are enabled by default. A switchover to a physical standby database is preferable because all databases in the configuration will be available as standby databases to the new primary database after the switchover operation completes. PDF Oracle Database 19c: Data Guard Administration Workshop Facebook:https://www.facebook.com/HariPrasathdba return until you issue the STOP OBSERVER command To proceed, you must first disable fast-start failover using the FORCE option, and then perform a manual failover. Then, on the Failover Confirmation page, click Yes to invoke the default Complete failover option. When the primary database and the (non-target) standby database regain network connectivity, the broker will propagate its current fast-start failover setting (ENABLED or DISABLED) to the non-target standby. The following sections describe how to reinstate or reenable a database. This may take a few minutes. This section describes how to configure and verify each prerequisite. By default, a fast-start failover is done when both the observer and the standby cannot reach the primary after the configured time threshold (FastStartFailoverThreshold) has passed. The following list indicates the extent to which fast-start failover is disabled in the broker configuration when the DISABLE FAST_START FAILOVER FORCE command is issued on the primary database, target standby database, and a standby database that is not the fast-start failover target. Relationship Between Primary, Target Standby, and Observer During Fast-start Failover. In this mode, the FastStartFailoverLagLimit configuration property is set to a non-zero value. This configuration property causes the former primary database to be automatically reinstated if a fast-start failover was initiated because the primary database was either isolated or had crashed. The time interval starts when the observer first loses its connection to the primary database. Immediate Failovers in Configurations Using Far Sync Instances. (Yes, bystanders need Flashback Database too). In the rare event that a switchover operation fails and you are left with no primary database, retry the switchover command. Most of the network services used in a FSFO environment may use dynamic registration, but to enable Broker to restart instances during role transitions or during reinstatement after a failover, you must define a static service named db_unique_name_dgmgrl. You can also switch the master observer hosts for a group of configurations to one specific host. SQL> Select Database_role from v$Database;

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