單項(xiàng)選擇題

An index called ORD_CUSTNAME_IX has been created on the CUSTNAME column in the ORDERS table using the following command：
SQL>CREATE INDEX ord_custname_ix ON orders（custname）；
The ORDERS table is frequently queried using the CUSTNAME column in the WHERE clause. You want to check the impact on the performance of the queries if the index is not available. You do not want the index to be dropped or rebuilt to perform this test.
Which is the most efficient method of performing this task？（）

A. disabling the index
B. making the index invisible
C. making the index unusable
D. using the MONITORING USAGE clause for the index

你可能感興趣的試題

單項(xiàng)選擇題

A PL/SQL procedure queries only those columns of a redefined table that were unchanged by the online table redefinition.
What happens to the PL/SQL procedure after the online table redefinition？（）

A. It remains valid.
B. It becomes invalid for all options of online table redefinition but automatically gets revalidated the next time it is used.
C. It becomes invalid for all options of online table redefinition and is automatically recompiled during online redefinition of the table.
D. It becomes invalid only if the storage parameters have been modified and it automatically gets revalidated the next time it is used.

單項(xiàng)選擇題

You create a new Automatic Database Diagnostic Monitor （ADDM） task：
instance_analysis_mode_task. To view the ADDM report， you use the following command：
SQL> SELECT dbms_addm.get_report（’my_instance_analysis_mode_task’） FROM dual；
You want to suppress ADDM output relating to Segment Advisor actions on user SCOTT’s segments.
What would you do to achieve this？（）

A. Add a finding directive for the ADDM task.
B. Add a segment directive for the ADDM task.
C. Add a parameter directive for the ADDM task.
D. Disable the Segment Advisor from the Automatic Maintenance Task.

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你可能感興趣的試題

A PL/SQL procedure queries only those columns of a redefined table that were unchanged by the online table redefinition. What happens to the PL/SQL procedure after the online table redefinition？（）

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A PL/SQL procedure queries only those columns of a redefined table that were unchanged by the online table redefinition.
What happens to the PL/SQL procedure after the online table redefinition？（）