18. 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?
你想要ADDM輸出關於segment的建議
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.
知識點：
ADDM是Oracle一個實現性能自我診斷的最佳利器。它依賴於AWR，也就是說ADDM要診斷，必要要有診斷的依據。
要使用ADDM，兩個重要的參數應進行正確的配置。
statistics_level：該參數建議設置爲TYPICAL
control_management_pack_access：該參數建議設置爲DIAGNOSTIC+TUNING，及診斷和優化包都被使用。
ADDM採樣 @?/rdbms/admin/addmrpt.sql
主要哪些問題導致了過高的DB Time 佔用，並提供建議。
參考：https://blog.csdn.net/leshami/article/details/70859672
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Returns a string containing the SQL text of an ASH query identifying the rows in ASH with impact for the finding |
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Retrieves the default text report of an executed ADDM task |
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Creates a directive to limit reporting of a specific finding type. |
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Creates a directive to prevent ADDM from creating actions to alter the value of a specific system parameter |
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Creates a directive to prevent ADDM from creating actions to "run Segment Advisor" for specific segments |
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Creates a directive to limit reporting of actions on specific SQL |
可以提供Creates a directive to prevent ADDM from creating actions to "run Segment Advisor" for specific segments
答案：B