Enable automatic tuning in the Azure portal to monitor queries and improve workload performance
Azure SQL Database automatically manages data services that constantly monitor your queries and identifies the action that you can perform to improve performance of your workload. You can review recommendations and manually apply them, or let Azure SQL Database automatically apply corrective actions - this is known as automatic tuning mode.
Automatic tuning can be enabled at the server or the database level through:
For Azure SQL Managed Instance, the supported option FORCE_LAST_GOOD_PLAN can only be configured through T-SQL only. The Azure portal based configuration and automatic index tuning options described in this article do not apply to Azure SQL Managed Instance.
Configuring automatic tuning options through the ARM (Azure Resource Manager) template is not supported at this time.
Enable automatic tuning on server
On the server level you can choose to inherit automatic tuning configuration from "Azure Defaults" or not to inherit the configuration. Azure defaults are FORCE_LAST_GOOD_PLAN is enabled, CREATE_INDEX is disabled, and DROP_INDEX is disabled.
As of March, 2020 new Azure defaults for automatic tuning are as follows:
- FORCE_LAST_GOOD_PLAN = enabled, CREATE_INDEX = disabled, and DROP_INDEX = disabled.
- Existing servers with no automatic tuning preferences configured are automatically configured to INHERIT the Azure defaults. This applies to all customers currently having server settings for automatic tuning in an undefined state.
- New servers created will automatically be configured to INHERIT the Azure defaults (unlike earlier when automatic tuning configuration was in an undefined state upon new server creation).
To enable automatic tuning on a server in Azure SQL Database, navigate to the server in the Azure portal and then select Automatic tuning in the menu.
Please note that the DROP_INDEX option at this time is not compatible with applications using partition switching and index hints and should not be enabled in these cases. Dropping unused indexes is not supported for Premium and Business Critical service tiers.
Select the automatic tuning options you want to enable and select Apply.
Automatic tuning options on a server are applied to all databases on this server. By default, all databases inherit configuration from their parent server, but this can be overridden and specified for each database individually.
To find out more about using a REST API to enable automatic tuning on a server, see Server automatic tuning UPDATE and GET HTTP methods.
Enable automatic tuning on an individual database
Azure SQL Database enables you to individually specify the automatic tuning configuration for each database. On the database level you can choose to inherit automatic tuning configuration from the parent server, "Azure Defaults" or not to inherit the configuration. Azure Defaults are set to FORCE_LAST_GOOD_PLAN is enabled, CREATE_INDEX is disabled, and DROP_INDEX is disabled.
The general recommendation is to manage the automatic tuning configuration at server level so the same configuration settings can be applied on every database automatically. Configure automatic tuning on an individual database only if you need that database to have different settings than others inheriting settings from the same server.
To enable automatic tuning on a single database, navigate to the database in the Azure portal and select Automatic tuning.
Individual automatic tuning settings can be separately configured for each database. You can manually configure an individual automatic tuning option, or specify that an option inherits its settings from the server.
Please note that DROP_INDEX option at this time is not compatible with applications using partition switching and index hints and should not be enabled in these cases.
Once you have selected your desired configuration, click Apply.
To find out more about using a REST API to enable automatic tuning on a single database, see Azure SQL Database automatic tuning UPDATE and GET HTTP methods.
To enable automatic tuning on a single database via T-SQL, connect to the database and execute the following query:
ALTER DATABASE current SET AUTOMATIC_TUNING = AUTO | INHERIT | CUSTOM
Setting automatic tuning to AUTO will apply Azure Defaults. Setting it to INHERIT, automatic tuning configuration will be inherited from the parent server. Choosing CUSTOM, you will need to manually configure automatic tuning.
To configure individual automatic tuning options via T-SQL, connect to the database and execute the query such as this one:
ALTER DATABASE current SET AUTOMATIC_TUNING (FORCE_LAST_GOOD_PLAN = ON, CREATE_INDEX = ON, DROP_INDEX = OFF)
Setting the individual tuning option to ON will override any setting that database inherited and enable the tuning option. Setting it to OFF will also override any setting that database inherited and disable the tuning option. Automatic tuning option, for which DEFAULT is specified, will inherit the automatic tuning configuration from the server level settings.
In the case of active geo-replication, Automatic tuning needs to be configured on the primary database only. Automatically applied tuning actions, such as for example index create or delete will be automatically replicated to the read-only secondary. Attempting to enable Automatic tuning via T-SQL on the read-only secondary will result in a failure as having a different tuning configuration on the read-only secondary is unsupported.
To find out more abut T-SQL options to configure automatic tuning, see ALTER DATABASE SET Options (Transact-SQL).
Disabled by the system
Automatic tuning is monitoring all the actions it takes on the database and in some cases it can determine that automatic tuning can't properly work on the database. In this situation, the tuning option will be disabled by the system. In most cases this happens because Query Store is not enabled or it's in read-only state on a specific database.
As automatic tuning is an Azure feature, to use it you will need to use Azure's built-in roles. Using SQL Authentication only will not be sufficient to use the feature from the Azure portal.
To use automatic tuning, the minimum required permission to grant to the user is Azure's built-in SQL Database contributor role. You can also consider using higher privilege roles such as SQL Server Contributor, SQL Managed Instance Contributor, Contributor, and Owner.
Configure automatic tuning e-mail notifications
See the automatic tuning e-mail notifications guide.
- Read the Automatic tuning article to learn more about automatic tuning and how it can help you improve your performance.
- See Performance recommendations for an overview of Azure SQL Database performance recommendations.
- See Query Performance Insights to learn about viewing the performance impact of your top queries.