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articles/sql-database/sql-database-service-tier-general-purpose.md

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title: General purpose service tier - Azure SQL Database | Microsoft Docs
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description: Learn about the Azure SQL Database general purpose tier
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title: General-purpose service tier - Azure SQL Database | Microsoft Docs
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description: Learn about the Azure SQL Database general-purpose tier
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services: sql-database
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ms.service: sql-database
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ms.subservice: service
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# General purpose service tier - Azure SQL Database
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> [!NOTE]
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> The general purpose service tier in the vCore-based purchasing model is called the standard service tier in the DTU-based purchasing model. For a comparison of the vCore-based purchasing model with the DTU-based purchasing model, see [Azure SQL Database purchasing models and resources](sql-database-purchase-models.md).
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> The general-purpose service tier in the vCore-based purchasing model is called the standard service tier in the DTU-based purchasing model. For a comparison of the vCore-based purchasing model with the DTU-based purchasing model, see [Azure SQL Database purchasing models and resources](sql-database-purchase-models.md).
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Azure SQL Database is based on SQL Server database engine architecture adapted for the cloud environment in order to ensure 99.99% availability even in the cases of infrastructure failures. There are three service tiers that are used in Azure SQL Database, each with different architectural models. These service tiers are:
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- General purpose
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- Business critical
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- Hyperscale
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The architectural model for the general purpose service tier is based on a separation of compute and storage. This architectural model relies on high availability and reliability of Azure Blob storage that transparently replicates database files and guarantees no data loss if underlying infrastructure failure happens.
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The architectural model for the general-purpose service tier is based on a separation of compute and storage. This architectural model relies on high availability and reliability of Azure Blob storage that transparently replicates database files and guarantees no data loss if underlying infrastructure failure happens.
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The following figure shows four nodes in standard architectural model with the separated compute and storage layers.
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![Separation of compute and storage](media/sql-database-managed-instance/general-purpose-service-tier.png)
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In the architectural model for the general purpose service tier, there are two layers:
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In the architectural model for the general-purpose service tier, there are two layers:
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- A stateless compute layer that is running the `sqlserver.exe` process and contains only transient and cached data (for example – plan cache, buffer pool, column store pool). This stateless SQL Server node is operated by Azure Service Fabric that initializes process, controls health of the node, and performs failover to another place if necessary.
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- A stateful data layer with database files (.mdf/.ldf) that are stored in Azure Blob storage. Azure Blob storage guarantees that there will be no data loss of any record that is placed in any database file. Azure Storage has built-in data availability/redundancy that ensures that every record in log file or page in data file will be preserved even if SQL Server process crashes.
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## When to choose this service tier
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General Purpose service tier is a default service tier in Azure SQL Database that is designed for most of the generic workloads. If you need a fully managed database engine with 99.99% SLA with storage latency between 5 and 10 ms that matches Azure SQL IaaS in most of the cases, General Purpose tier is the option for you.
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General Purpose service tier is a default service tier in Azure SQL Database that is designed for most of the generic workloads. If you need a fully managed database engine with 99.99% SLA with storage latency between 5 and 10 ms that match Azure SQL IaaS in most of the cases, General Purpose tier is the option for you.
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## Next steps
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