单项选择题
A.The sessions are able to perform only queries.
B.The sessions are not affected and continue to function normally.
C.The sessions are terminated and the active transactions are rolled back.
D.The sessions are not allowed to perform any operations till the listener is started
单项选择题 You have two tables with referential integrity enforced between them. You need to insert data to the child tablefirst because it is going to be a long transaction and data for the parent table will be available in a later stage，which can be inserted as part of the same transaction. View the Exhibit to examine the commands used tocreate tables. Which action would you take to delay the referential integrity checking until the end of thetransaction（）
单项选择题 ViewtheExhibittoexaminetheoutputproducedbythefollowingqueryatthreedifferenttimessincethedatabaseinstancestartedandhasexperiencedworkloadsofdifferentcapacities：SQL>SELECTsubstr（component，0，10）COMP，current_sizeCS，user_specified_sizeUSFROMv$memory_dynamic_componentsWHEREcurrent_size!=0；Whatdoyouinferfromthis（）
多项选择题 Youperformdifferentialincrementallevel1backupsofyourdatabaseoneachworkingdayandlevel0backuponSundays，totape.Whichtwostatementsaretrueaboutdifferentialincrementalbackups（）