[单选] 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.

Given： Which command-line invocations will compile？（） javac Mule.java。 javac -source 1.3 Mule.java。 javac -source 1.4 Mule.java。 javac -source 1.5 Mule.java。荚膜对于初次参加装置检修的施工单位及新入厂的职工，进入施工现场以前，安全保卫部门应对这部分人员进行（）。增大风量时，应开大送风机的入口挡板。 A shoot-out has erupted between your MS development teams using .NET and your Linux development teams using Java. Knowing that your database is in danger，which command would you use to back up your NOARCHIVELOG mode database using RMAN with compression？（） backup database all。 backup compressed database。 backup as compressed backupset database。 backup as compressed backup database plus archivelog all。 backup as compressed backupset database plus compress archivelog all。 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？（）

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[单选] 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？（）

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