单项选择题
View the Exhibit and examine the attributes of an undo tablespace. In an OLTP system, the user SCOTT has started a query on a large table in the peak transactional hourthat performs bulk inserts. The query runs for more than 15 minutes and then SCOTT receives thefollowing error: ORA-01555: snapshot too old What could be the reason for this error（）
A.The query is unable to get a read-consistent image. B.There is not enough space in Flash Recovery Area. C.There is not enough free space in the flashback archive. D.The query is unable to place data blocks in undo tablespace
单项选择题 EMPDET is an external table containing the columns EMPNO and ENAME. Which command would work in relation to the EMPDET table？（）
问答题 穆旦诗歌艺术的创新，主要体现在哪几个方面？
单项选择题 ItisconsideredabestpracticetousetheDeadPeerDetection(DPD)featurewithwhichVPNtopologies?（）
