OCP-1Z0-053-V13.02-221题

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

Parameter	Description
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;

/