多项选择题
A.Multiple transactions can use the same undo segment.
B.A transaction is assigned an undo segment when it is started.
C.More than one transaction cannot share the same extent in the undo tablespace.
D.The transactions use system undo segment to store undo data if all the segments in the undo tablespaceare used.
多项选择题 View the Exhibit1， which shows the options that are selected to create the user SL_REP. View the Exhibit2 andexamine the contents of DATABASE_PROPERTIES. Which two statements are true regarding this user（）
多项选择题 WhichtwofilesinthedatabasecanbeconfiguredforautomaticbackupsbyusingtheautobackupfeatureinRecoveryManager（RMAN）（）
单项选择题 Your test database is configured to run in NOARCHIVELOG mode. One of the data files in the USERS tablespace is lost due to a media failure. You notice that all the online redo logs have been overwritten sincethe last backup. What would you do to recover the data file（）