You can only create a geo-secondary for an existing database. Active geo-replication terminology and capabilities For more information about designing solutions for disaster recovery, see Designing Cloud Solutions for Disaster Recovery Using active geo-replication. Then, you must take adequate steps to ensure that your service functions during the failover of the services on which it depends.
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Therefore, you need to identify all dependent services and understand the guarantees and capabilities they provide. It is critical that all components are resilient to the same failures and become available within the recovery time objective (RTO) of your application.
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Examples of these components include the client software (for example, a browser with a custom JavaScript), web front ends, storage, and DNS. Recovering an application (service) end-to-end after a catastrophic failure requires recovery of all components that constitute the service and any dependent services.
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To achieve full business continuity, adding database regional redundancy is only a part of the solution. Application upgrades: You can create an extra secondary as a fail back copy during application upgrades.Database migration: You can use active geo-replication to migrate a database from one server to another with minimum downtime.In addition to disaster recovery, active geo-replication can be used in the following scenarios: The following figure shows an example of active geo-replication configured with a primary in the North Central US region and a geo-secondary in the South Central US region. Geo-replication RPO can be found in Overview of Business Continuity.
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Regional redundancy provided by geo-replication enables applications to quickly recover from a permanent loss of an entire Azure region, or parts of a region, caused by natural disasters, catastrophic human errors, or malicious acts. It is unrelated to transactional replication, which replicates changes by executing DML (INSERT, UPDATE, DELETE) commands on subscribers. In other words, changes made by uncommitted transactions are not visible.Īctive geo-replication replicates changes by streaming database transaction log from the primary replica to secondary replicas. While at any given point, a secondary database might be slightly behind the primary database, the data on a secondary is guaranteed to be transactionally consistent.
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If for any reason your primary database fails, you can initiate a geo-failover to any of your secondary databases. The following diagram illustrates a typical configuration of a geo-redundant cloud application using Active geo-replication. If your application requires a stable connection endpoint and automatic geo-failover support in addition to geo-replication, use Auto-failover groups.
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To migrate SQL databases from Azure Germany using active geo-replication, see Migrate SQL Database using active geo-replication.