The overall cost of answering a query includes the transfer cost from the storage provider or data origin to the
query evaluator, the cost of resources utilized at the query evaluator and other nodes, and the cost to transfer the results
to the query initiator. The data placement problem is to distribute data and work so the full query workload is answered
with lowest cost under the existing resource and bandwidth constraints.
Tham khảo sách 'solving enterprise applications performance puzzles.ieee press 445 hoes lane piscataway, nj', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả
Pulmonary hypertension is characterized by a mediator imbalance with a
predominance of vasoconstriction and cell proliferation involving all layers of the
vessel. The end result is an increase in pulmonary vascular resistance, increased
workload of the right ventricle, and right ventricular hypertrophy to maintain an
adequate flow. Subsequently, right ventricular dilatation ensues the signs and
symptoms of right heart failure occurence.