var sidebar_align = 'right';
var content_container_margin = parseInt('290px');
var sidebar_width = parseInt('270px');
Unanswered: Performance view
As quite a lots of value in performance view is accumulative, these value will be reset if instance is restarted, but our env is 24 x 7, can I reset these value without restart the instance?
I dont believe you can reset these views. If you want stats between two times I would suggest using statspack (or using Enterprise Manager).
If its your own homegrown app just take snapshots of the tables and subtract the values (if they are not averages etc).