How to reduce size of Tracking Database BizTalkDTADb

There are 2 ways,
1- purge the BizTalkDTADb with archive options
2- purge the BizTalkDTADb with no archive option.

when to use what?
if the old tracking information is not required at all then use the 2nd option other wise use the first option with the relevant arguments .
see following article to run the commands.
http://msdn.microsoft.com/en-us/library/aa578470.aspx