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Merge pull request #15585 from pmasl/patch-832
Update best-practice-with-the-query-store.md
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docs/relational-databases/performance/best-practice-with-the-query-store.md

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## <a name="Insight"></a> Use Query Performance Insight in Azure SQL Database
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If you run Query Store in Azure [!INCLUDE[ssSDS](../../includes/sssds-md.md)], you can use [Query Performance Insight](https://docs.microsoft.com/azure/sql-database/sql-database-query-performance) to analyze resource consumption over time. While you can use [!INCLUDE[ssManStudio](../../includes/ssmanstudio-md.md)] and [Azure Data Studio](https://docs.microsoft.com/sql/azure-data-studio/what-is) to get detailed resource consumption for all your queries, such as CPU, memory, and I/O, Query Performance Insight gives you a quick and efficient way to determine their impact on overall DTU consumption for your database. For more information, see [Azure SQL Database Query Performance Insight](https://azure.microsoft.com/documentation/articles/sql-database-query-performance/).
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If you run Query Store in [!INCLUDE[ssSDSfull](../../includes/sssdsfull-md.md)], you can use [Query Performance Insight](https://docs.microsoft.com/azure/sql-database/sql-database-query-performance) to analyze resource consumption over time. While you can use [!INCLUDE[ssManStudio](../../includes/ssmanstudio-md.md)] and [Azure Data Studio](../../azure-data-studio/what-is.md) to get detailed resource consumption for all your queries, such as CPU, memory, and I/O, Query Performance Insight gives you a quick and efficient way to determine their impact on overall DTU consumption for your database. For more information, see [Azure SQL Database Query Performance Insight](https://azure.microsoft.com/documentation/articles/sql-database-query-performance/).
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This section describes optimal configuration defaults that are designed to ensure reliable operation of the Query Store and dependent features. Default configuration is optimized for continuous data collection, that is minimal time spent in OFF/READ_ONLY states. For more information about all available Query Store options, see [ALTER DATABASE SET options (Transact-SQL)](../../t-sql/statements/alter-database-transact-sql-set-options.md).
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This section describes optimal configuration defaults that are designed to ensure reliable operation of the Query Store and dependent features. Default configuration is optimized for continuous data collection, that is minimal time spent in OFF/READ_ONLY states. For more information about all available Query Store options, see [ALTER DATABASE SET options (Transact-SQL)](../../t-sql/statements/alter-database-transact-sql-set-options.md#query-store).
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| Configuration | Description | Default | Comment |
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| --- | --- | --- | --- |
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> [!IMPORTANT]
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> These defaults are automatically applied in the final stage of Query Store activation in all Azure SQL databases (see preceding important note). After this light up, Azure SQL Database won't be changing configuration values set by customers, unless they negatively impact primary workload or reliable operations of the Query Store.
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> These defaults are automatically applied in the final stage of Query Store activation in all [!INCLUDE[ssSDSfull](../../includes/sssdsfull-md.md)]. After it's enabled, [!INCLUDE[ssSDSfull](../../includes/sssdsfull-md.md)] won't change configuration values that are set by customers, unless they negatively impact primary workload or reliable operations of the Query Store.
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> [!NOTE]
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> Query Store cannot be disabled in Azure SQL Database single database and elastic pool. Executing ALTER DATABASE [database] SET QUERY_STORE = OFF will return the warning 'QUERY_STORE=OFF' is not supported in this version of SQL Server.
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> Query Store cannot be disabled in [!INCLUDE[ssSDSfull](../../includes/sssdsfull-md.md)] single database and Elastic Pool. Executing `ALTER DATABASE [database] SET QUERY_STORE = OFF` will return the warning `'QUERY_STORE=OFF' is not supported in this version of SQL Server.`.
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If you want to stay with your custom settings, use [ALTER DATABASE with Query Store options](https://msdn.microsoft.com/library/bb522682.aspx) to revert configuration to the previous state. Check out [Best Practices with the Query Store](https://msdn.microsoft.com/library/mt604821.aspx) in order to learn how top chose optimal configuration parameters.
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If you want to stay with your custom settings, use [ALTER DATABASE with Query Store options](../../t-sql/statements/alter-database-transact-sql-set-options.md#query-store) to revert configuration to the previous state. Check out [Best Practices with the Query Store](../../relational-databases/performance/best-practice-with-the-query-store.md) in order to learn how to choose optimal configuration parameters.
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## Use Query Store with elastic pool databases
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## Use Query Store with Elastic Pool databases
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You can use Query Store in all databases without concerns, in even densely packed pools. All issues related to excessive resource usage that might have occurred when Query Store was enabled for the large number of databases in the elastic pools have been resolved.
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