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La différence entre A7 et A8 :
A7 : Max 2TB de disque
A8 : Max 4TB de disque
A9 : Max 6TB de disque
Pour ces versions, tout dépend de l’offre de la VM SQL que l’on choisit
Geo-Replication has two options:
Standard Geo-Replication is available on both Standard and Premium service tiers. You can create a single offline secondary of your database in a different region than your primary. The target and the source region are fixed pairs, and so the secondary is created in a predetermined region based on the location of the primary database. The offline secondary is offline and does not accept client connections. In the event of a datacenter failure or prolonged database unavailability, you will receive a notification and then the option to access and activate the offline secondary becomes available. The offline secondary is created with the same service tier and performance level as the primary database, but the charges vary. For pricing details, see SQL Database Pricing Details.
Active Geo-Replication is available for the Premium service tier only. You can set as many as four replicas, one of which can be an offline secondary, in any region you choose. If the primary replica fails, you terminate the continuous copy relationship from a secondary replica. The original secondary replica now becomes the new primary replica. You can then re-configure your application to connect to the new primary replica. For more information, see Active Geo-Replication for Azure SQL Database.