Diagnose Msg 7356 by comparing linked-server column metadata, stabilizing pass-through projections, and reviewing provider configuration.
SQL SERVER – FIX – Error 1402. Could not open key: UNKNOWN\Components. System error 5
Installing a SQL Server service pack failed with Error 1402. Could not open key: UNKNOWN\Components. System error 5. Here is the fix.
SQL SERVER – FIX: Error 19456: None of the IP Addresses Configured for the Availability Group Listener can be Hosted by the Server
Deploying a hybrid AlwaysOn availability group across on-premises and Azure, adding a replica failed with error 19456. Here is what fixed it.
UpdateHADRResource Failed to Version-Copy File: System.IO.IOException
UpdateHADRResource failed during a 2017 SQL Server 2012 patch because Setup could not copy hadrres.dll while another process used it. This post shows how to read the setup log, check the file and its owner, and read the HADR state of an instance with tested queries and commands.
SQL SERVER Management Studio – Exception of type ‘System.OutOfMemoryException’ was thrown. (mscorlib)
Copying a huge result set from the SSMS grid threw ‘Exception of type System.OutOfMemoryException was thrown’. Why it happens and a better way to export.
SQL SERVER – The header for file Path is not a valid database file header. The PageAudit property is incorrect
SQL Server would not start: model.mdf did not have a valid database file header and the PageAudit Property was incorrect. How I got it running again.
Database Mirroring Connection Error 4: An Error Occurred While Receiving Data 10054
A database mirroring connection error needs evidence from both ends of the connection. In a 2017 Azure case, the clue was a missing CONNECT permission on the endpoint. I tested the endpoint queries on SQL Server 2025 with a scratch endpoint, a grant, a deny and a stopped endpoint.