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  • OCP-1Z0-053-V12.02-40题

    40.Evaluate the following code:

    SQL>VARIABLE task_name VARCHAR2(255); 

    SQL>VARIABLE sql_stmt VARCHAR2(4000);

    SQL>BEGIN :sql_stmt := 'SELECT COUNT(*) FROM customers WHERE cust_state_province =''CA''';

    :task_name := 'MY_QUICKTUNE_TASK';

    DBMS_ADVISOR.QUICK_TUNE(DBMS_ADVISOR.SQLACCESS_ADVISOR,

    :task_name, :sql_stmt);

    END;

    What is the outcome of this block of code?

    A. It creates a task and workload, and executes the task.

    B. It creates a task and workload but does not execute the task.

    C. It produces an error because a template has not been created.

    D. It produces an error because the SQL Tuning Set has not been created.

    Answer: A

    答案解析:

    参考:http://docs.oracle.com/cd/E11882_01/server.112/e41573/advisor.htm#PFGRF94911


    Performing a Quick Tune

    To tune a single SQL statement, the QUICK_TUNE procedure accepts as its input a task_name and a SQL statement. The procedure creates a task and workload and executes this task. There is no difference in the results from using QUICK_TUNE. They are exactly the same as those from using EXECUTE_TASK, but this approach is easier to use when there is only a single SQL statement to be tuned. The syntax is as follows:

    DBMS_ADVISOR.QUICK_TUNE (
       advisor_name           IN VARCHAR2,
       task_name              IN VARCHAR2,
       attr1                  IN CLOB,
       attr2                  IN VARCHAR2 := NULL,
       attr3                  IN NUMBER := NULL,
       task_or_template       IN VARCHAR2 := NULL);

    The following example shows how to quick tune a single SQL statement:

    VARIABLE task_name VARCHAR2(255);
    VARIABLE sql_stmt VARCHAR2(4000);
    EXECUTE :sql_stmt := 'SELECT COUNT(*) FROM customers
                          WHERE cust_state_province =''CA''';
    EXECUTE :task_name  := 'MY_QUICKTUNE_TASK';
    EXECUTE DBMS_ADVISOR.QUICK_TUNE(DBMS_ADVISOR.SQLACCESS_ADVISOR,
                  :task_name, :sql_stmt);

     

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  • 原文地址:https://www.cnblogs.com/hzcya1995/p/13316588.html
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