Microsoft has long given us DBA tools and suggestions to help tune databases, to fix queries with indexes, and many times they were of questionable merit. We have all seen the dreaded dta_index names in a database and rolled our eyes knowing that sometimes these indexes are not what is needed. While the Database Tuning Advisor, has gotten better over time it is still not a tool more senior DBAs use. Microsoft made big steps in helping DBAs with performance with the introduction of Query Store in both Azure SQL Database and SQL Server 2016. Query Store collects execution and run-time performance information. Microsoft has taken an additional leap with the introduction of Automatic Tuning. Automatic Tuning is an intelligent performance tuning service which is the results of machine learning processes being applied directly to data generated by Query Store.
source https://www.c-sharpcorner.com/article/what-is-automatic-tuning-in-azure-sql-database/
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