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【单选题】What is true if you want to switch undo tablespaces from the current one， called UNDO1， to a new one called UNDO2？（）
A.
It is NOT possible to switch unless no active transaction exist in UNDO1.
B.
It is possible to switch to UNDO2； but current active transactions will abort.
C.
It is possible to switch to UNDO2； current active transactions will be automatically migrated to UNDO2.
D.
It is possible to switch to UNDO2； only current active transactions will continue to execute inside UNDO1.
【多选题】患者男，56岁，农民，因“间断发热１个月，腰痛并活动受限1周”来诊。上午一般状况尚好，下午症状明显，畏寒，偶伴寒战，30min后体温达39℃左右，有时高达40℃，热退时出现原因不明的大汗淋漓。在当地以“上呼吸道感染”口服阿莫西林及中药、退热等对症治疗，自述症状较前稍有好转，当地住院4~5d后病情“缓解”出院。但1周后患者再次发热，同时出现全身关节游走性痛，反复发作1个月，症状进行性加重。1周腰痛并...
A.
布鲁菌病
B.
病毒性肝炎
C.
风湿病
D.
腰椎骨质增生
E.
发热待查
F.
伤寒
G.
不能确诊
【多选题】You require the Oracle server to manage the undo segments and space among various active sessions automatically. You created an undo tablespace， UNDO_TBS1， in your database. Which two additional steps...
A.
Set the UNDO_RETENTION parameter to 900 or more.
B.
Create an initial undo segment in the undo tablespace.
C.
Enable the retention guarantee for the undo tablespace.
D.
Set the UNDO_TABLESPACE parameter to UNDO_TBS1.
E.
Set the UNDO_MANAGEMENT initialization parameter to AUTO.
【单选题】The UNDO_RETENTION parameter in your database is set to 1000 and undo retention is not guaranteed. Which statement regarding retention of undo data is correct？（）
A.
Undo data becomes obsolete after 1，000 seconds.
B.
Undo data gets refreshed after every 1，000 seconds.
C.
Undo data will be stored permanently after 1，000 seconds.
D.
Committed undo data would be retained for 1，000 seconds if free undo space is available.
E.
Undo data will be retained in the UNDO tablespace for 1，000 seconds，then it gets moved to the TEMPORARY tablespace to provide read consistency.
【简答题】在UNDO命令执行之后，立即键入什么命令可以将UNDO 命令取消重新执行一次 (A)ERASE (B)REDO (C)OOPS (D)REDRAW
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