compact & repair

To be clear-...

when is strictlkly necessary to compact & repair acess db:
when update recordset or insert recordset or read recordset, or ....

???

i use vb6 and ado jet 4.0 in this project

http://www.databasedev.co.uk/compact...ms-access.html
http://support.microsoft.com/kb/209769/en-us