单项选择题
Which statement is true about the UNDO_RETENTION parameter when retention guarantee is notenabled（）
A.It is the time period after which the undo data becomes obsolete.
B.It is the time period after which the committed undo data would be transferred to a temporarytablespace.
C.It is the minimum time period up to which the committed undo data would be retained if free undo spaceis available.
D.It is the time period after which the undo data is transferred to the Flash Recovery Area to provide readconsistency.
相关考题
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单项选择题
InwhichsituationmaytheUNDO_RETENTIONparameterbeignored，evenifitissettoavalue（）
A.when the data file of the undo tablespace is autoextensible
B.when there are more than one undo tablespaces available in the database
C.when the undo tablespace is of a fixed size and retention guarantee is not enabled
D.when the undo tablespace is autoextensible and retention guarantee is not enabled -
单项选择题
YourdatabaseinstanceisconfiguredwithautomaticundomanagementandtheUNDO_RETENTIONparameterissetto900seconds.Youexecutedthefollowingcommandtoenableretentionguarantee：SQL>ALTERTABLESPACEundotbs1RETENTIONGUARANTEE；Whateffectwouldthiscommandhaveonthedatabase（）
A.The extents in the undo tablespace retain data until the next full database backup.
B.The extents containing committed undo in the undo tablespace are not overwritten for at least 15minutes.
C.The extents containing committed data in the undo tablespace are not overwritten until the instance isshut down.
D.The extents containing committed undo in the undo tablespace are transferred to Flash Recovery Areabefore being overwritten. -
单项选择题
View the Exhibit and examine the undo tablespace attributes. Your database instance is experiencing a large volume of transactions from non-DBA users in the last onehour. The undo tablespace UNDOTBS1 is full with transactions and no transaction was committed morethan one hour ago. The database has two more undo tablespaces. What happens to the new DML operations in this scenario（）
A.The DML commands will fail.
B.The undo data generated by the DML is stored in one of the two other undo tablespaces.
C.The undo data generated by the DML will overwrite the extents that contain committed undo data.
D.The undo data generated by the DML is stored in the SYSTEM undo segment of the SYSTEM
