关键词: 云计算，Session，内容等级，数据库请求分类，数据库自适应

Abstract: Nowadays, many studies have been focused on cloud computing in I T industry. Mass of users’requests on database exists in instance of cloud computing. It has a significant impact on system performance if we do not classify these requests on database reasonably. How to classify these requests, in order to achieve the Web QoS standard, is a aporia and key point in the study of cloud computing. hhere arc many defects in original request pattern, which is based on first come and first service. For instance, priority requirements from customers cannot be satisfied, and we failed to reach the aim of profit maximization. Moreover, service resources cannot be fully used. Therefore, we put forward the database request classification algorithm based on Session and content level. We also put forward a performance function based on Session and content level. hhis function takes customers' priority into consideration, in order to make Gusto- mers' rectuest with high priority getting service resources first. While to the others, owing to the introduction of time function in our algorithm, their priorities will get promoted and finally get processed as the waiting time goes by. The situation of endless waiting will be avoided. hherefore, this algorithm is a kind of dynamic database request classification of database adaptive. In our algorithm, not only the rectuest with highly priority will get processed first, but also it is en- sured that the request with lower priority will be processed although their priority is not enough.

Key words: Cloud computing, Session, Content level, Database request classification, Database adaptive