Windows update breaks SQL Server database connections
Recent Windows updates leave SQL Server connections open after queries finish. This slows down performance over time.
Microsoft confirmed that Windows updates released since October 2026 are hurting SQL Server. When server queries finish, they leave connections open that build up instead of closing.
SQL Server linked server queries using OLE DB providers are affected. Oracle and PostgreSQL databases are among those affected.
Database admins can manually close connections or restart the SQL service. These are quick fixes but do not fully solve the problem long-term.
Microsoft is releasing an update within days. Microsoft can also provide a workaround to customers who contact Microsoft Support for Business.
- October 2026 Patch Tuesday
- Affected Windows update
- Windows 10, 11, Server 2012 and later
- Affected systems
- Oracle, PostgreSQL
- Databases affected
- OLE DB providers leave connections open
- Connection behavior
Why it mattersDatabase slowdowns can break applications. They can also disrupt data access for businesses. The fix is urgent for any company running SQL Server.
AustraliaAustralian businesses relying on SQL Server should apply Microsoft's fixes when released to avoid performance failures affecting their operations.
