单项选择题
YouaremaintainingyourOLTPdatabaseinOracle10g.Whileobservingtheperformanceofthedatabase，youfindthatthelogswitchoccursmorethanonceforevery20minutes，affectingthedatabaseperformance.Whichfactorisresponsibleforfrequentlogswitches？（）A.thevalueoftheUNDO_RETENTIONinitializationparameterB.thevalueoftheoptimalredologfilesizeprovidedbytheRedoLogfileSizeAdvisorC.theonlineredologfilessizeD.thenumberofredologmembersinagroup
单项选择题 BtoB电子商务指的是().
判断题 putchar函数可以向终端输出一个字符或字符型变量值。()
单项选择题 以下属于BtoB电子商务的是().
