多选题Examine the following output： SQL> SELECT index_name，status FROM dba_indexes WHERE status=’UNUSABLE’； INDEX_NAME STATUS------------------------------ ----------- EIND UNUSABLE Which two statements about the above index are true（）AIt is ignored by the q

第1题：

Given the following table definition: STOCK: item VARCHAR(30) status CHAR(1) quantity INT price DEC(7,2) If items are indicated to be out of stock by setting STATUS to NULL and QUANTITY and PRICE to zero, which of the following statements would be used to update the STOCK table to indicate that all the items whose description begins with the letter "S" are out of stock?（）

• A、UPDATE stock SET (status = NULL; quantity, price = 0) WHERE item LIKE S%
• B、UPDATE stock SET (status, quantity, price) = (NULL, 0, 0) WHERE item LIKE S%
• C、UPDATE stock SET status = NULL, SET quantity = 0, SET price = 0 WHERE item LIKE 'S%'
• D、UPDATE stock SET (status = NULL), (quantity = 0), (price = 0) WHERE item LIKE S%

第2题：

Examine the following output： SQL> SELECT index_name，status FROM dba_indexes WHERE status=’UNUSABLE’； INDEX_NAME STATUS------------------------------ ----------- EIND UNUSABLE Which two statements about the above index are true（）

• A、It is ignored by the query optimizer.
• B、It is not used while the index is being rebuilt.
• C、The index cannot be rebuilt， and has to be re-created.
• D、The index is automatically rebuilt when used the next time

第3题：

Examine the following PL/SQL block：   DECLARE   my_plans pls_integer； BEGIN  my_plans ：= DBMS_SPM.LOAD_PLANS_FROM_CURSOR_CACHE （sql_id=> ？9twu5t2dn5xd？； END；   Which statement is true about the plan being loaded into the SQL plan baseline by the above command？（）

• A、 It is loaded with the FIXED status.
• B、 It is loaded with the ACCEPTED status.
• C、 It is not loaded with the ENABLED status.
• D、 It is not loaded with the ACCEPTED status.

第4题：

Which two statements are true regarding subqueries? （）

• A、A subquery can retrieve zero or more rows 
• B、Only two subqueries can be placed atone level 
• C、A subquery can be used only in SQL query statements 
• D、A subquery can appear on either side of a comparison operator 
• E、There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement 

第5题：

Which parameter allows SQL*Loader to load data into a table with the indexes in the unusable state， prior to the load operation？（）

• A、INDEXES
• B、SKIP_INDEXES_MAINTENANCE
• C、SKIP_UNUSABLE_INDEXES
• D、RESUMABLE
• E、INDEXES_UNUSABLE

第6题：

You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index. Which two are possible if table updates are performed which affect the invisible index columns?（）

• A、The index remains invisible.
• B、The index is not updated by the DML statements on the indexed table.
• C、The index automatically becomes visible in order to have it updated by DML on the table.
• D、The index becomes unusable but the table is updated by the DML.
• E、The index is updated by the DML on the table.

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第13题：

Which of the following dbx commands should be used to obtain a stack trace from a coredump file?（）

• A、trace 
• B、where 
• C、status 
• D、which

第14题：

Examine the SQL statement that creates ORDERS table: CREATE TABLE orders (SER_NO NUMBER UNIQUE, ORDER_ID NUMBER, ORDER_DATE DATE NOT NULL, STATUS VARCHAR2(10) CHECK (status IN ('CREDIT', 'CASH')), PROD_ID NUMBER REFERENCES PRODUCTS(PRODUCT_ID), ORD_TOTAL NUMBER, PRIMARY KEY (order_id, order_date)); For which columns would an index be automatically created when you execute the above SQL statement? （）

• A、SER_NO
• B、ORDER_ID
• C、STATUS
• D、PROD_ID
• E、ORD_TOTAL
• F、composite index on ORDER_ID and ORDER_DATE

第15题：

Examine the command that is used to create a table：  SQL> CREATE TABLE orders（oid NUMBER（6） PRIMARY KEY， odate DATE， ccode NUMBER（6）， oamt NUMBER（10，2）） TABLESPACE users；  Which two statements are true about the effect of the above command） （）

• A、A CHECK constraint is created on the OID column.
• B、A NOT NULL constraint is created on the OID column.
• C、The ORDERS table is the only object created in the USERS tablespace.
• D、The ORDERS table and a unique index are created in the USERS tablespace.
• E、The ORDERS table is created in the USERS tablespace and a unique index is created on the OIDcolumn in the SYSTEM tablespace.

第16题：

Examine the following statement that is used to modify the constraint on the SALES table： SQL> ALTER TABLE SALES MODIFY CONSTRAINT pk DISABLE VALIDATE； Which three statements are true regarding the above command（）

• A、The constraint remains valid.
• B、The index on the constraint is dropped.
• C、It allows the loading of data into the table using SQL*Loader.
• D、New data conforms to the constraint， but existing data is not checked
• E、It allows the data manipulation on the table using INSERT/UPDATE/DELETE SQL statements.

第17题：

Note the output of the following query；   SQL> SELECT flashback_archieve_name， status FROM dba_flashback_archieve； FLASHBACK_ARCHIEVE_NAME STATUS FLA1   You executed the following command to enable Flashback Data Archive on the EXCHANGB_PATE table：   ALTER TABLE exchange_rate FLASHBACK ARCHIEVE；   What is the outcome of this command？（）  

• A、 The table uses the default Flashback Data Archive.
• B、 The Flashback Data Archive Is created In the SYSAUX tablespace.
• C、 The Flashback Data Archive is created in the same tablespace where the tables are stored.
• D、 The command generates an error because no flashback Data Archive name is specified and there is no default Flashback Data Achieve.

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