Time of table's last changes?

Please, help me:

Is there any way to know at what time the data in some table were
changed last time? - to check this time and if it is changed, re-download data from
that table - in cases when the table is too big.

Now I use for such thing the rules on insert, update and delete. But
if the changes are too intensive it's not an escape.

Pavel Mamin,
Network Programmer,
SkyNet Co. ISP, Yekaterinburg, Russia