记忆在这里化作永恒

1.Your database is running under automatic undo management and the UNDO_RETENTION parameter is set to 900 sec.
You executed the following command to enable retention guarantee:
ALTER TABLESPACE undotbs1 RETENTION GUARANTEE
What efeect would this statement have on the database?
A – The extents in undo tablespace retain data until the next full database backup.
B – The extents containing committed data in the undo tablespace are never overwritten.
C – The extents which no longer contain uncommitted data in the undo tablespace
are not overwritten for at least 15 minutes.
D – The extents containing committed data in the undo tablespace are not overwritten
until the instance is shut down.

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1.What are the consequences of executing the SHUTDOWN ABORT command(Choose tow)

A – The database files are synchronized.
B – Uncommitted changes are no rolled back.
C – The database is closed,but the instance is still started.
D – Database buffers and redo buffers are not written to the disk.
E – The data base undergose automatic media recovery during the next startup.

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