BystandersFollowRoleChange : dgmgrl

Oracle Dataguard BystandersFollowRoleChange Property

BystandersFollowRoleChange

Valid Values: ALL| NONE
Broker Default: ALL

Lets first look at What is Bystander Database ?
The concept of bystander comes only if you have multiple standby databases.
Bystander standby database is the standby database that is not directly involved in switchover or failover. In other words all standby databases except failover target database is considered as bystander standby. v$database.fs_failover_status = 'BYSTANDER' can we queried to find the list of bystander databases.

The BystandersFollowRoleChange configuration property establishes whether bystander standby databases are evaluated during failover (value = ALL) or after failover (value = NONE).

Descriptions of the ALL and NONE options are as follows:

ALL - During the failover process, the broker determines whether the bystander standby databases are ahead of or behind the failover target standby (that is, the standby that will be the new primary).

If the bystander standbys are ahead, they will be disabled with a status of ORA-16661 as part of the failover operation. The bystander standbys must be reinstated after failover completes. The broker reinstates a standby through a flashback to the SCN at which the target standby became a primary database, and sets up the redo transport configuration from the new primary to the standby.

If the bystander standbys are behind, then the broker simply sets up the redo transport configuration from the soon-to-be-new-primary to these standbys and completes the failover process.

NONE - During the failover process, the broker does NOT evaluate the status of the bystander standbys as part of the failover operation. They are marked as disabled with a status of ORA-16661 so that they can be evaluated later. The broker simply completes the failover to produce a new primary database as soon as possible.

After the failover is completed, you can reinstate the bystander standbys. During reinstatement of a bystander, the broker determines whether the bystander is ahead of, or behind, the new primary. If the bystander is ahead of the new primary, then the broker automatically flashes back the standby to the SCN at which the target standby became a primary database and sets up redo transport from the new primary to the standby. (Even if a flashback is not required, the broker sets up the redo transport configuration from the new primary to these standbys.)

The NONE option decreases the processing time for failover, but disables broker management of all bystander databases in the configuration. If fast-start failover is enabled, then the observer automatically reinstates the standby databases after failover has completed. Otherwise, you will have to manually reinstate the standby databases after failover has completed.

DGMGRL> edit configuration set property BystandersFollowRoleChange =NONE;
Property "BystandersFollowRoleChange " updated

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