OCP-1Z0-053-V13.02-221题

nmkl

221.To generate recommendations to improve the performance of a set of SQL queries in an application,
you execute the following blocks of code:
BEGIN dbms_advisor.create_task(dbms_advisor.sqlaccess_advisor,'TASK1'); END;/
BEGIN dbms_advisor.set_task_parameter('TASK1','ANALYSIS_SCOPE','ALL');
dbms_advisor.set_task_parameter('TASK1','MODE','COMPREHENSIVE');
END;
/
BEGIN
dbms_advisor.execute_task('TASK1');
dbms_output.put_line(dbms_advisor.get_task_script('TASK1'));
END;
/
The blocks of code execute successfully; however, you do not get the required outcome.
What could be the reason?
A. A template needs to be associated with the task.
B. A workload needs to be associated with the task.
C. The partial or complete workload scope needs to be associated with the task.
D. The type of structures (indexes, materialized views, or partitions) to be recommended need to be
specified for the task.
Answer: B
答案解析：
参考：http://docs.oracle.com/cd/E11882_01/appdev.112/e40758/d_advis.htm#ARPLS65121




　　GET_TASK_SCRIPT Function
　　Creates and returns an executable SQL script of the Advisor task's recommendations in a buffer
　　SQL Access Advisor



GET_TASK_SCRIPT Function
　　
　　
This function creates a SQL*Plus-compatible SQL script and sends the output to file. The script will contain all of the accepted recommendations from the specified task.
　　Syntax
DBMS_ADVISOR.GET_TASK_SCRIPT (   task_name          IN VARCHAR2   type               IN VARCHAR2 := 'IMPLEMENTATION',   rec_id             IN NUMBER   := NULL,   act_id             IN NUMBER   := NULL,   owner_name         IN VARCHAR2 := NULL,   execution_name     IN VARCHAR2 := NULL,   object_id          IN NUMBER   := NULL)RETURN CLOB;　　Parameters
　　Table 18-19 GET_TASK_SCRIPT Function Parameters
ParameterDescription　　task_name
　　The task name that uniquely identifies an existing task.
　　type
　　Specifies the type of script to generate. The possible values are IMPLEMENTATION and UNDO.
　　rec_id
　　An optional recommendation identifier number that can be used to extract a subset of the implementation script.
　　A zero or the value DBMS_ADVISOR.ADVISOR_ALL indicates all accepted recommendations would be included. The default is to include all accepted recommendations for the task.
　　act_id
　　Optional action identifier number that can be used to extract a single action as a DDL command.
　　A zero or the value DBMS_ADVISOR.ADVISOR_ALL indicates all actions for the recommendation would be included. The default is to include all actions for a recommendation.
　　owner_name
　　An optional task owner name.
　　execution_name
　　An identifier of a specific execution of the task. It is needed only for advisors that allow their tasks to be executed multiple times.
　　object_id
　　An identifier of an advisor object that can be targeted by the script.

　　Return Values
　　Returns the script as a CLOB buffer.
Usage Notes
　　Though the script is ready to execute, Oracle recommends that the user review the script for acceptable locations for new materialized views and indexes.
For a recommendation to appear in a generated script, it must be marked as accepted.
Examples
DECLARE  task_id NUMBER;  task_name VARCHAR2(30);  workload_name VARCHAR2(30);  buf CLOB;BEGIN  task_name := 'My Task'; workload_name := 'My Workload';   DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name); DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload'); DBMS_ADVISOR.ADD_SQLWKLD_REF(task_name, workload_name);  DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT(workload_name, 'MONTHLY', 'ROLLUP',                                     100,400,5041,103,640445,680000,2,                                     1,SYSDATE,1,'SH','SELECT AVG(amount_sold)                                     FROM sh.sales');  DBMS_ADVISOR.EXECUTE_TASK(task_name);    buf := DBMS_ADVISOR.GET_TASK_SCRIPT(task_name);END;/
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