Youexecutedthefollowingcommands:SQL>ALTERSESSIONSETOPTIMIZER_USE_PENDING_STATISTICS=false;SQL>EXECUTEDBMS_STATS.SET_TABLE_PREFS(’SH’,’CUSTOMERS’,’PUBLISH’,’false’);SQL>EXECUTEDBMS_STATS.GATHER_TABLE_STATS(’SH’,’CUSTOMERS’);WhichstatementiscorrectregardingtheabovestatisticscollectionontheSH.CUSTOMERStableintheabovesession?()
A.Thestatisticsarestoredinthependingstatisticstableinthedatadictionary.
B.Thestatisticsaretreatedasthecurrentstatisticsbytheoptimizerforallsessions.
C.Thestatisticsaretreatedasthecurrentstatisticsbytheoptimizerforthecurrentsessionsonly.
D.Thestatisticsaretemporaryandusedbytheoptimizerforallsessionsuntilthissessionterminates.
第1题:
设a=2,b=3,c=4,d=5,下列表达式的值是______。 Not a<=c Or 4*c=b^2 And b<>a+c
A. -1
B.1
C.True
D.False
第2题:
第3题:
第4题:
A、移码突变
B、碱基置换
C、非整倍体
D、DNA大段损伤
E、平衡易位
第5题: