Help:how do you clean up perfstat.stats$snapshot?

I created a trigger as follows:

create or replace trigger perfstatonstatup after startup on database
begin
delete from perfstat.stats$snapshot where snap_id <= (select max (snap_id) from perfstat.stats$snapshot); commit;
end perfstatonstatup;

It just take too long in the process. When I try to truncate the table perfstat.stats$snapshot, I have to disable all the foreign constaint  and then re-enable them, and have to truncate each table one by one.

Is there any better way to deal with it?

Thanks  

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