松南十屋断陷扇三角洲和辫状河三角洲沉积体系特征

The Southern of Shiwu Fault Depression in Songliao of fan delta and braided river delta of the features of sedimentary system

从岩相、测井相和地震相三方面入手,将扇(辫状河)三角洲沉积相划分为扇(辫状河)三角洲平原亚相、扇(辫状河)三角洲前缘亚相和前扇(辫状河)三角洲亚相,并识别出辫状河道微相、辫状分流河道微相、水下水道微相、前缘砂微相、边缘席状砂微相、开阔湖沉积微相和水下重力流沉积微相。

In database, when many users operate the identical set of data in the identical database simultaneously, possibly will have the loss to renew, dirty reads, reading can not be repeated, hallucinations reading and so on. Through the research of concurrent control in da- tabase, this article introduced the types of lock mecha- nism and the levels of isolation between affairs in SQL database ,and elaborated actually how to use locks and levels of isolation between affairs to solve the muhiuser concurrent problems.