Microsoft has confirmed that Windows updates released since the October 2026 Patch Tuesday are causing performance and stability problems in SQL Server, according to BleepingComputer, citing a Windows release health dashboard update on Wednesday, November 11.
According to Microsoft, the bug affects SQL Server linked server queries that use OLE DB providers to connect to external databases, including Oracle and PostgreSQL: connections stay open after the queries finish, accumulate and degrade performance over time.
The company says it affects Windows 10, Windows 11 and Windows Server 2012 and later, and that it will fix it with an out-of-band update in the coming days. Meanwhile, administrators can close the connections manually or restart the service, which can kill active queries and does not stop the problem from returning, or request a mitigation from Microsoft Support for Business.
Developing story: the original notice on Microsoft's Windows release health dashboard still needs to be read; the notice was published on November 11, slightly before this slot's window.
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