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單項(xiàng)選擇題

You want to use the automatic management of backup and recovery operations features for your database.Which configuration must you set?（）

A. Enable the flash recovery area and specify it as the archived redo log destination.
B. Disable the flash recovery area and start the database instance in ARCHIVELOG mode.
C. Enable the flash recovery area but do not specify it as the archived redo log destination.
D. Disable the flash recovery area and start the database instance in NOARCHIVELOG mode

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多項(xiàng)選擇題

Evaluate the following statements：  
CREATE TABLE purchase_orders （po_id NUMBER（4）， 
po_date TIMESTAMP， supplier_id NUMBER（6）， po_total NUMBER（8，2）， 
CONSTRAINT order_pk PRIMARY KEY（po_id）） PARTITION BY RANGE（po_date） 
（PARTITION Q1 VALUES LESS THAN （TO_DATE（？1-apr-2007？d-mon-yyyy？）， PARTITION Q2 VALUES LESS THAN 
（TO_DATE（？1-jul-2007？d-mon-yyyy？）， 
PARTITION Q3 VALUES LESS THAN（TO_DATE（？1-oct - 2007？d-mon-yyyy？）， PARTITION Q4 VALUES LESS THAN （TO_DATE（？1-jan-2008？d-mon-yyyy？））； 
CREATE TABLE purchase_order_items （po_id NUMBER（4） NOT NULL， product_id NUMBER（6） NOT NULL， unit_price NUMBER（8，2）， quantity NUMBER（8）， CONSTRAINT po_items_fk FOREIGN KEY 
（po_id） REFERENCES purchase_orders（po_id）） PARTITION BY REFERENCE（po_items_fk）；  
What are the two consequences of the above statements？（）

A. Partitions of PURCHASE_ORDER_ITEMS have system-generated names.
B. Both PURCHASE_ORDERS and PURCHASE_ORDER_ITEMS tables are created with four partitions each. 
C. Partitions of the PURCHASE_ORDER_ITEMS table exist in the same tablespaces as the partitions of the PURCHASE_ORDERS table.
D. The PURCHASE_ORDER_ITEMS table inherits the partitioning key from the parent table by  automatically duplicating the key columns.
E. Partition maintenance operations performed on the PURCHASE_ORDER_ITEMS table are automatically reflected in the PURCHASE_ORDERS table.
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