单项选择题
A.Backups will never expire.
B.It removes any retention policy.
C.The DELETE OBSOLETE command will fail with an error.
D.It sets the retention policy to the default of REDUNDANCY 1.
单项选择题 Examine the command： ALTER DATABASE ADD SUPPLEMENTAL LOG DATA （PRIMARY KEY） COLUMNS； What does the command accomplish？（）
单项选择题 Howcanyoumakeasharedserver-sideinitializationparameterfileavailabletoallinstancesofaRealApplicationClustersdatabase？（）
多项选择题 AutomaticConsumerGroupSwitchingisanimportantnewfeatureoftheDatabaseResourceManager.Whichthreeplandirectiveparametersareusedtocontrolthisfeature？（）