This is a repro package to demonstrate the Automatic Tuning (Auto Plan Correction) in SQL Server 2017. This feature is using telemtry from the Query Store feature we launched with Azure SQL Database and SQL Server 2016 to provide built-in intelligence.
This is a repro package to demonstrate the Automatic Tuning (Auto Plan Correction) in SQL Server 2017. This feature is using telemtry from the Query Store feature we launched with Azure SQL Database and SQL Server 2016 to provide built-in intelligence. Oct 14, 2019 Azure SQL Database is a fully managed relational database with built-in intelligence supporting self-driving features such as performance tuning and threat alerts. Explore all SQL Database pricing options and find the performance that fits your workload. Visit the SQL DB pricing page Trusted by companies of all sizes. Jun 04, 2018 Azure SQL Database Managed Instance is a new Azure service in public preview that offers almost 100% compatibility with SQL Server, but also provides the power of a fully managed database service.
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This repro assumes the following:
- Sep 20, 2019 Azure SQL Database automatic tuning provides peak performance and stable workloads through continuous performance tuning based on AI and machine learning.
- Jan 31, 2017 Azure SQL Database autotuning is not just a wizard SQL Server provides custom recommendations by using the Azure SQL Database Advisor, enabling maximal performance. The SQL Database Advisor makes recommendations for creating and dropping indexes, parameterizing queries, and fixing schema issues.
Azure Sql Database Auto-tune
- SQL Server 2017 installed (pick at minimum Database Engine) on Windows. This feature requires Developer or Enterprise Edition.
- You have installed SQL Server Management Studio or SQL Operations Studio (https://docs.microsoft.com/en-us/sql/sql-operations-studio/download)
- You have downloaded the RML Utilities from https://www.microsoft.com/en-us/download/details.aspx?id=4511.
- These demos use a named instance called SQL2017. You will need to edit the .cmd scripts which connect to SQL Server to change to a default instance or whatever named instance you have installed.
Install ostress from the package RML_Setup_AMD64.msi. Add C:Program FilesMicrosoft CorporationRMLUtils to your path.
Restore the WideWorldImporters database backup to your SQL Server 2017 instance. The WideWorldImporters-Full.bak is provided along with a restorewwi.sql script to restore the database. This script assumes the backup is in the C:C:sql_sample_databases directory and that all database files will be placed in c:temp. Change the location for the backup and your files as needed.
Run repro_setup.cmd to customize the WideWorldImporters database for the demo. You will only need to run this one time after restoring the backup.
Setup Performance Monitor on Windows to track SQL Statistics/Batch Requests/sec
Run initalize.cmd to setup the repro for default of recommendations. If you restart the demo from the beginning, you can run this again to 'reset' the demo.
Run report.cmd to start the workload. This will pop-up a command window running the workload. Note the chart showing Batch Requests/Sec as your workload throughput
Run regression.cmd (you may need to run this a few times for timing reasons). Notice the drop in batch requests/sec which shows a performance regression in your workload.
Load recommendations.sql into SQL Server Management Studio or SQL Operations Studio and review the results. Notice the time difference under the reason column and value of state_transition_reason which should be AutomaticTuningOptionNotEnabled. This means we found a regression but are recommending it only, not automatically fixing it. The script column shows a query that could be used to fix the problem.
Stop the report.cmd workload by pressing + in the command window and pressing 'y' to stop. This should close that command window.
Now let's see what happens with automatic plan correction which uses this command in SQL Server 2017
ALTER DATABASE SET AUTOMATIC_TUNING ( FORCE_LAST_GOOD_PLAN = ON )
Run auto_tune.cmd which uses the above command to set automatic plan correct ON for WideWorldImporters
Repeat steps 6-8 as above. In Performance Monitor you will see the batch requests/sec dip but within a second go right back up. This is because SQL Server detected the regression and automatically reverted to 'last known good' or the last known good query plan as found in the Query Store. Note in the output of recommendations.sql the state_transition_reason now says LastGoodPlanForced.