单项选择题
A.displays only the list of default values
B.displays only the list of all basic parameters
C.displays the currently in effect parameter values
D.displays only the list of all advanced parameters
E.displays the list of all the parameter files of a database
多项选择题 Whichthreestatementsarecorrectabouttemporarytables？（）
单项选择题 TheUNDO_RETENTIONparameterinyourdatabaseissetto1000andundoretentionisnotguaranteed.Whichstatementregardingretentionofundodataiscorrect？（）
单项选择题 YoureceivedcomplaintsaboutthedegradationofSQLqueryperformance.YouidentifiedtopSQLqueriesthatconsumetime.WhatwouldbeyournextsteptofindoutrecommendationsaboutstatisticscollectionandrestructuringoftheSQLstatementtoimprovequeryperformance？（）