HOW MUCH YOU NEED TO EXPECT YOU'LL PAY FOR A GOOD PNL

How do I mitigate fallout of organization downtime owing wrongfully utilized safety patch due to inconsistent terminologyThe portfolio of bonds may have a particular DV01, which can be utilized to compute the PnL. Can anyone tell me if this is right or is there some thing more? For equities it should be just an easy sum of stock charges at the end