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SQL Server upgrade fails and returns error 15173 or 15559

When you apply a CU or an SP for SQL Server, the Setup program reports the following error: Wait on the Database Engine recovery handle failed. Check the SQL Server ...
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SQL Server upgrade fails and returns error 4860

When you install a CU or SP for SQL Server, the Setup program reports the following error: Wait on the Database Engine recovery handle failed. Check the SQL Server ...
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sql-server-upgrade-failed-error-574.md

This article helps you troubleshoot and solve an issue where a Cumulative Update (CU) or Service Pack (SP) for SQL Server reports error 574 when executing database ...