Performance considerations during taking back up-- - response (7) by Nishant.Bhardwaj

Hi Dieter ,
Both are having same Structures but they are created at different databases, i mean, one at LIVE and other at BACKUP Db.
does different DB's making the usage of spool in INSERT Select?
 
Also can you please  suggest the scenrios which MERGE gives the OPTIMAL performance?
 
THanks!
Nishant