Error Message:
Msg 7940, Level 16, State 1, Line 1
System databases master, model, msdb, and tempdb cannot be detached.
Severity level:
16.
Description:
This error message appears when you try to detach one of SQL Server own system databases.
Consequences:
The T-SQL statement can be parsed, but causes the error at runtime.
Resolution:
Error of the Severity level 16 are generated by the user and can be fixed by the SQL Server user. You cannot detach the system databases.
Versions:
All versions of SQL Server.
Example(s):
USE master
EXEC sp_detach_db ‘TempDB’
Remarks:
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