SQL Server would not start after patching: script level upgrade for database master failed with error 4860, SqlTraceCollect.dtsx does not exist. The fix.
SQL SERVER – Stop Growing MSDB Database by Removing sysmail_mailitems History
A client’s MSDB database had grown huge from Database Mail history and was slowing things down. Here is how to clean up sysmail_mailitems and stop the growth.
SQL SERVER – guest User and MSDB Database – Enable guest User on MSDB Database
I advise disabling the guest user in user databases, but it should stay enabled in the MSDB Database. Here is why, and how to enable it again if it was turned off.



