Microsoft confirms recent Windows updates cause SQL Server performance degradation due to lingering open connections
Microsoft has acknowledged that Windows updates released since the October 2026 Patch Tuesday are causing performance and stability issues in SQL Server environments. The problem stems from SQL Server linked server queries using OLE DB providers that fail to close connections properly, resulting in an accumulation of open connections, particularly affecting connections to Oracle and PostgreSQL databases. This degradation impacts both client (Windows 10 and 11) and server (Windows Server 2012 and later) platforms. Microsoft recommends temporarily closing connections manually or restarting SQL services to alleviate symptoms, though these are short-term measures. An out-of-band Windows update is planned in the coming days to resolve this issue. Additionally, IT administrators can contact Microsoft Support for Business for mitigation guidance in the interim. The issue compounds recent SQL Server problems related to memory management on Windows Server 2025 and deployment failures of November 2026 Windows updates on some Windows 11 systems.
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Microsoft confirms recent Windows updates cause SQL Server performance degradation due to lingering open connections
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Microsoft has acknowledged that Windows updates released since the October 2026 Patch Tuesday are causing performance and stability issues in SQL Server environments. The problem stems from SQL Server linked server queries using OLE DB providers that fail to close connections properly, resulting in an accumulation of open connections, particularly affecting connections to Oracle and PostgreSQL databases. This degradation impacts both client (Windows 10 and 11) and server (Windows Server 2012 and later) platforms. Microsoft recommends temporarily closing connections manually or restarting SQL services to alleviate symptoms, though these are short-term measures. An out-of-band Windows update is planned in the coming days to resolve this issue. Additionally, IT administrators can contact Microsoft Support for Business for mitigation guidance in the interim. The issue compounds recent SQL Server problems related to memory management on Windows Server 2025 and deployment failures of November 2026 Windows updates on some Windows 11 systems.