ChangeDatabaseInstance("<DBServerName>") not working

Question

When I am executing the below PS script it's throwing the update conflict error : $db = get-spdatabase -identity $db.ChangeDatabaseInstance("") $db.Update() Update error: An update conflict has occurred, and you must re-try this action. The object SPServer Name=SQLSERVERAG was updated by domain\userid123 in the w3wp (14568) process What could be the possible reason I could look into.