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All database administrators have experienced something like this at one point. A query that was running well suddenly starts to create problems. No error, failure, or warning appears on the dashboard, and the only noticeable sign is users complaining that the application is running slowly today. Now the DBA must determine which of the countless queries is causing the problem. The best solution here is the Query Store tool.
If you haven't done any restoration of your backups, you cannot count it as your retrieval strategy. It's simply a case of gambling. The backup job completes successfully once the data is written – how it will do after that is a different story.
Weighted Baseline Regression Pattern for Query Store Plan regression in SQL Server usually shows up quietly. A query that has been stable for a long time suddenly becomes slower, even though there were no deployments, schema changes, or obvious infrastructure problems. In many cases, the issue is tied to an execution plan change caused by statistics updates, parameter sensitivity, changing data distribution, or normal optimizer behavior.
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