Process model identification and related PID controller auto-tuning are verified by extensive simulations. This paper presents a novel method of PID controller tuning suitable for higher-order aperiodic processes and aimed at step response-based auto-tuning applications.
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Azure SQL Database is an automatically managed data service that constantly monitors 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 the Azure portal, REST API calls and T-SQL commands.
Note
For Managed Instance, the supported option FORCE_LAST_GOOD_PLAN can be configured through T-SQL only. Portal based configuration and automatic index tuning options described in this article do not apply to Managed Instance.
Note
Configuring Automatic tuning options through 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 enabled, and DROP_INDEX is disabled.
Important
As of March, 2020 changes to Azure defaults for automatic tuning will take effect as follows:
New Azure defaults will be FORCE_LAST_GOOD_PLAN = enabled, CREATE_INDEX = disabled, and DROP_INDEX = disabled.
Existing servers with no automatic tuning preferences configured will be automatically configured to INHERIT the new 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 new Azure defaults (unlike earlier when automatic tuning configuration was in an undefined state upon new server creation).
Azure portal
To enable automatic tuning on Azure SQL Database logical server, navigate to the server in Azure portal and then select Automatic tuning in the menu.
Note
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. Dropping unused indexes is not supported for Premium and Business Critical service tiers.
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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.
REST API
Find out more about using REST API to enable Automatic tuning on a server, see SQL Server Automatic tuning UPDATE and GET HTTP methods.
Enable automatic tuning on an individual database
The 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 enabled, and DROP_INDEX is disabled.
Tip
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.
Azure portal
To enable automatic tuning on a single database, navigate to the database in 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.
Rest API
Find out more about using REST API to enable Automatic tuning on a single database, see SQL Database Automatic tuning UPDATE and GET HTTP methods.
T-SQL
To enable automatic tuning on a single database via T-SQL, connect to the database and execute the following query:
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:
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.
Important
How To Determine If Auto-tuning Is On A Number
In case of active geo-replication, Automatic tuning needs to be configured on the primary database only. Automatically applied tuning actions, such are 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.
Find our more abut T-SQL options to configure Automatic tuning, see ALTER DATABASE SET Options (Transact-SQL) for SQL Database server.
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, 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.
Permissions
As automatic tuning is Azure feature, to use it you will need to use Azure's built-in RBAC roles. Using SQL Authentication only will not be sufficient to use the feature from Azure portal.
To use automatic tuning, the minimum required permission to grant to the user is Azure's built-in SQL DB contributor role. You can also consider using higher privilege roles such are SQL Server Contributor, Contributor and Owner.
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Configure automatic tuning e-mail notifications
See automatic tuning e-mail notifications guide.
Next steps
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.
Up until now, performance tuning was one of those things that was best left up to the experts. Pushing the limits of your graphics card can be intimidating to a lot of people. With the latest Radeon Software Adrenalin 2020 Edition, we’ve taken away some of that complexity by adding simplified controls and automatic presets for novice users, while also providing advanced tools for experts who want full control of their GPU.
Let’s begin with the new user experience for performance metrics, where gamers can view vital system and performance information at a glance.
Metrics
1. Metrics Overview: Allows users to view multiple different system metrics at once. Users can click different metrics here to view more detailed metrics on each of these items. Users can also show/hide specific items for the Performance Metrics Overlay.
2. Metrics Details: Once a user has chosen a metric from the overview column, they can view more detailed statistics for each of those metrics in this window.
Performance Tuning
Performance Tuning now has a fully automatic view. The automatic view allows more entry level or novice users access to features that allow them to automatically configure their performance tuning using Radeon Software features without having to learn how to overclock*. Some of these features include Auto Undervolt GPU, Auto Overclock GPU and Auto Overclock VRAM. Feature availability is dependent on the system hardware and some Radeon graphics products may not have all features listed.
Auto Tuning Features
The auto tuning features step through an algorithm that runs a workload on your graphics process while it fine tunes your overclock to determine stable settings based on your chosen tuning option. Once instability is detected on your GPU in the algorithm, we dial back to the best previous stable values and apply those. This is done on a per system basis so users can expect to get a good stable overclock that suits their own personal system. The overall process only takes about a minute to complete and should be done without any applications open for the best experience possible.
Undervolt GPU: Attempts to perform an undervolt while maintaining close to stock performance for your graphics product. This can potentially increase performance per watt and save power.
Overclock GPU: Attempts to perform an overclock of your graphics engine frequency. This can potentially increase performance in games that are GPU bound.
Overclock VRAM: Attempts to perform an overclock of your video memory. This can potentially increase performance in games that are memory bound.
Tuning Control (Manual): Performance Tuning also has a new manual view. The manual view allows for much deeper customization of your graphics product and overclocking. The manual view contains detailed controls for GPU Tuning, Fan Tuning, VRAM Tuning and Power Tuning. Each of these views can be expanded to customize or tune each individual part of your graphics product and some can be expanded to provided more advanced and fine grain controls.
Once you’ve chosen a specific category you’d like to tune you can expand the options to see all the controls available to tune. From there you can control or modify any items you’d like, hit apply to save your settings and you’re good to go with your overclock!
Breakdown of the functions below:
GPU Tuning: Allows you to access controls for voltage and frequency. For newer AMD graphics products this advanced view includes controlling a voltage/frequency curve to help define how your graphics product behaves at any given engine clock.
Fan Tuning: Allows you to access controls for fan speed tuning and fan curve. At the basic level this includes controls for max fan speed and at a more advanced level controls fan curve for customization of fan behavior at certain temperature thresholds.
VRAM Tuning: Allows you to access controls for memory frequency tuning.
Power Tuning: Allows you to access controls for power graphics power limit.
Get the most out of your Radeon graphics card and take advantage of all the things Radeon Software has to offer. Be sure to check out our other blogs in the links below and find out how you can stream content to your favorite social media site or play games on your mobile device anywhere in the world.
Download Radeon Software Adrenalin 2020 Edition today and change the way you game!
Warren Eng is the Product Marketing Manager for Radeon Software at AMD. His postings are his own opinions and may not represent AMD’s positions, strategies or opinions. Links to third party sites are provided for convenience and unless explicitly stated, AMD is not responsible for the contents of such linked sites and no endorsement is implied. GD-5
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* Overclocking any AMD processor, including without limitation, altering clock frequencies / multipliers or memory timing / voltage, to operate beyond their stock specifications will void any applicable AMD product warranty, even when such overclocking is enabled via AMD hardware and/or software. This may also void warranties offered by the system manufacturer or retailer. Users assume all risks and liabilities that may arise out of overclocking AMD processors, including, without limitation, failure of or damage to hardware, reduced system performance and/or data loss, corruption or vulnerability.