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docs/database-engine/install-windows/change-the-database-compatibility-mode-and-use-the-query-store.md

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---
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title: "Change the Database Compatibility Mode and Use the Query Store | Microsoft Docs"
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title: "Change the Database Compatibility Level and Use the Query Store | Microsoft Docs"
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ms.custom: ""
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ms.date: "07/21/2017"
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ms.prod: sql
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ms.author: mikeray
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manager: craigg
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---
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# Change the Database Compatibility Mode and Use the Query Store
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# Change the Database Compatibility Level and use the Query Store
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[!INCLUDE[appliesto-ss-xxxx-xxxx-xxx-md-winonly](../../includes/appliesto-ss-xxxx-xxxx-xxx-md-winonly.md)]
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> [!IMPORTANT]
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> If the compatibility level of a user database was 100 or higher before the upgrade, it remains the same after upgrade.
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> If the compatibility level of a user database was 90 before upgrade, in the upgraded database, the compatibility level is set to 100, which is the lowest supported compatibility level in [!INCLUDE[ssCurrent](../../includes/sscurrent-md.md)].
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> If the compatibility level of a user database was 90 before upgrade, in the upgraded database, the compatibility level is set to 100, which is the lowest supported compatibility level in [!INCLUDE[ssSQL17](../../includes/sssql17-md.md)].
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> The compatibility levels of the tempdb, model, msdb and Resource databases are set to the current compatibility level after upgrade.
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> The master system database retains the compatibility level it had before upgrade.
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![query-store-usage-5](../../relational-databases/performance/media/query-store-usage-5.png "query-store-usage-5")
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## See Also
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[View or Change the Compatibility Level of a Database](../../relational-databases/databases/view-or-change-the-compatibility-level-of-a-database.md)
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[Query Store Usage Scenarios](../../relational-databases/performance/query-store-usage-scenarios.md)
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[View or Change the Compatibility Level of a Database](../../relational-databases/databases/view-or-change-the-compatibility-level-of-a-database.md)
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[Query Store Usage Scenarios](../../relational-databases/performance/query-store-usage-scenarios.md)
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[ALTER DATABASE (Transact-SQL) Compatibility Level](../../t-sql/statements/alter-database-transact-sql-compatibility-level.md)
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