Base de opciones sobre acciones no calificadas
Preventing normal failovers after a forced quorum is required because of the possibility than an unsynchronized secondary replica would appear to be synchronized on the reconfigured WSFC cluster. Within a given availability group, the set of all availability replicas whose operational state is currently ONLINE, regardless of availability mode and of failover mode. The former primary replica, when available, switches to the secondary role, and its databases become secondary databases.
Assuming that the original primary replica can access the new primary instance, reconnecting occurs automatically and transparently. However, when a former primary database comes online, it base de opciones sobre acciones no calificadas divergent from the current primary database, so the database administrator needs to make either the removed database or the current primary database inaccessible to clients to avoid further divergence of the databases and to prevent client-failover issues. Because the transaction cannot be rolled back, it is deferred.
If you can temporarily prevent the original primary replica from reconnecting over the network to the new primary replica, you can inspect the original primary base de opciones sobre acciones no calificadas to evaluate what data would be lost if they were resumed. Como las transacciones no se pueden revertir, se convierten en transacciones diferidas. Automatic failover is best suited when the WSFC node that hosts the primary replica is local to the node that hosts the secondary replica.
Tareas relacionadas Related Tasks. On Node A, the primary replica continues to accept updates, and on Node B, the secondary replica continues to synchronize with the primary replica. When the target secondary replica is synchronized, manual failover without data loss is possible even if the primary replica has crashed because the secondary databases are ready for failover.
When the former primary replica comes back online, it takes on the secondary role, and the former primary database becomes the secondary database. After an online restore, any deferred transactions are resolved. As soon as the new secondary replica has resynchronized the databases, failover is again possible, but in the reverse direction. Mantener la disponibilidad durante las actualizaciones Maintaining Availability During Upgrades. Configured for synchronous-commit mode.
Before the failover, the primary replica is hosted by the server instance on Node If transactions were deferred because of a bad page and if a good backup of the database does not exist, use the following process to repair the database: For example, the query can be run by a job that executes every minute on each primary database. Preventing normal failovers after a forced quorum is required because of the possibility than an unsynchronized secondary replica would appear to be synchronized on the reconfigured WSFC cluster. The primary replica has become unavailable, and the failover-condition levels defined by your the flexible failover policy have been met.
If the secondary replica fails, automatic failover is not possible because the automatic failover target is unavailable. Asynchronous-commit replicas support only the manual failover mode. The failover target is the availability replica hosted by the server instance on Node
If any log is waiting in the recovery queue of any secondary database, the secondary replica finishes rolling forward that secondary database. Secciones de este tema: Within the context of an availability group, the primary role and secondary role of availability replicas are typically interchangeable in a process known as failover. Three forms of failover exist: An availability replica can be configured to support automatic failover at any point.