多项选择题

Which three statements about direct path exports are true？（）

A.A
B.B
C.C
D.D
E.E
F.F

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多项选择题

Some data storage and transfer media have fixed-length physical records.
When the data records are short， more then one can be stored in a single， physical record to use the storage space efficiently. Consider this data：
1119 Smith 1120 Yvonne 1121 Albert 1130 Thomas
Which two statements can you use to load the data into the EMP table？（）

A.A
B.B
C.C
D.D

单项选择题

Data file DF1 belongs to tablespace TS1.，and the database is in ARCHIVELOG mode. You did an incomplete recover in the following steps：
1. Take data file DF1 offline.
2. Copy a backup copy of DF1 into the current DF1 location.
3. Execute RECOVER DATAFILE UNTIL TIME sometime in the past.
4. Bring DF1 online.
5. Execute ALTER DATABASE OPEN RESETLOGS.
To guarantee that the database is recoverable in the future， what is the least amount of work needed？（）

A.Back up the data file.
B.Bring tablespace TS1 online.
C.Copy redo logs to the backup directory.
D.Make a complete backup right after opening the database.

单项选择题

An index-organized table （IOT） called SPARSE has had many records deleted. Which command reorganizes the IOT so that the empty space is removed， while minimizing the impact for users？（）

A.EXPORT with TABLES and IMPORT with the INDEX and IGNORE options.
B.ALTER TABLE … COALESCE ；
C.ALTER INDEX …REBUILD ONLINE；
D.CREATE TABLE …AS SELECT_ONLINE；