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Copy file name to clipboardExpand all lines: articles/azure-sql/database/service-tier-hyperscale-frequently-asked-questions-faq.yml
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author: dimitri-furman
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ms.author: dfurman
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ms.reviewer: kendralittle, mathoma
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ms.date: 11/4/2021
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ms.date: 1/10/2022
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title: Azure SQL Database Hyperscale FAQ
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How many Read Scale-out replicas are supported?
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The Hyperscale databases are created with one Read Scale-out replica (two replicas including primary) by default. You can scale the number of read-only replicas between 0 and 4 using [Azure portal](https://portal.azure.com) or [REST API](/rest/api/sql/databases/createorupdate). Additionally, many read scale-out scenarios can be enabled using [named replicas](service-tier-hyperscale-replicas.md#named-replica-in-preview).
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You can scale the number of read-only replicas between 0 and 4 using [Azure portal](https://portal.azure.com) or [REST API](/rest/api/sql/databases/createorupdate). Additionally, many read scale-out scenarios can be enabled using [named replicas](service-tier-hyperscale-replicas.md#named-replica-in-preview).
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For high availability, do I need to provision additional compute replicas?
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In Hyperscale databases, data resiliency is provided at the storage level. You only need one replica to provide resiliency. When the compute replica is down, a new replica is created automatically with no data loss.
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However, if there’s only one replica, it may take some time to build the local cache in the new replica after failover. During the cache rebuild phase, the database fetches data directly from the page servers, resulting in higher storage latency and degraded query performance.
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However, if there's only one replica, it may take some time to build the local cache in the new replica after failover. During the cache rebuild phase, the database fetches data directly from the page servers, resulting in higher storage latency and degraded query performance.
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For mission-critical apps that require high availability with minimal failover impact, you should provision at least 2 compute replicas including the primary compute replica. This is the default configuration. That way there is a hot-standby replica available that serves as a failover target.
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For mission-critical apps that require high availability with minimal failover impact, you should provision at least 2 compute replicas including the primary compute replica. That way there is a hot-standby replica available that serves as a failover target.
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How many secondary HA replicas can I provision?
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We create one secondary HA replica for Hyperscale databases by default. If you want to adjust the number of replicas, you can do so using [Azure portal](https://portal.azure.com) or [REST API](/rest/api/sql/databases/createorupdate).
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Between 0 and 4. If you want to adjust the number of replicas, you can do so using [Azure portal](https://portal.azure.com) or [REST API](/rest/api/sql/databases/createorupdate).
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author: dimitri-furman
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# Hyperscale service tier
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-**Compute**:
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The Hyperscale compute unit price is per replica. The [Azure Hybrid Benefit](https://azure.microsoft.com/pricing/hybrid-benefit/) price is applied to high-availabilty and named replicas automatically. We create a primary replica and one secondary [high-availability replica](service-tier-hyperscale-replicas.md) per Hyperscale database by default. Users may adjust the total number of high-availability replicas from 0-4, depending on the needed [SLA](https://azure.microsoft.com/support/legal/sla/azure-sql-database/).
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The Hyperscale compute unit price is per replica. The [Azure Hybrid Benefit](https://azure.microsoft.com/pricing/hybrid-benefit/) price is applied to high-availabilty and named replicas automatically. Users may adjust the total number of high-availability secondary replicas from 0 to 4, depending on [SLA](https://azure.microsoft.com/support/legal/sla/azure-sql-database/) requirements.
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-**Storage**:
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You don't need to specify the max data size when configuring a Hyperscale database. In the hyperscale tier, you're charged for storage for your database based on actual allocation. Storage is automatically allocated between 40 GB and 100 TB, in 10-GB increments. Multiple data files can grow at the same time if needed. A Hyperscale database is created with a starting size of 10 GB and it starts growing by 10 GB every 10 minutes, until it reaches the size of 40 GB.
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You don't need to specify the max data size when configuring a Hyperscale database. In the Hyperscale tier, you're charged for storage for your database based on actual allocation. Storage is automatically allocated between 40 GB and 100 TB, in 10-GB increments. Multiple data files can grow at the same time if needed. A Hyperscale database is created with a starting size of 10 GB and it starts growing by 10 GB every 10 minutes, until it reaches the size of 40 GB.
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For more information about Hyperscale pricing, see [Azure SQL Database Pricing](https://azure.microsoft.com/pricing/details/sql-database/single/)
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