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Microsoft: Recent Windows updates cause SQL Server performance issues
Microsoft has confirmed that Windows updates released since the October 2026 Patch Tuesday are causing SQL Server performance and stability issues.
Summary
Microsoft has confirmed that Windows updates released since the October 2026 Patch Tuesday are causing SQL Server performance and stability issues. As detailed in a Windows release health dashboard update on Wednesday, this is caused by server queries that leave connections open after the queries complete. These connections accumulate instead of closing, degrading server performance over time.
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