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Oracle 1Z0-147 Exam Sample Questions

Question: 2

Which three are true statements about dependent objects? (Choose three)

  1. Invalid objects cannot be described.
  2. An object with status of invalid cannot be a referenced object.
  3. The Oracle server automatically records dependencies among objects.
  4. All schema objects have a status that is recorded in the data dictionary.
  5. You can view whether an object is valid or invalid in the USER_STATUS data dictionary view.
  • You can view whether an object is valid or invalid in the USER_OBJECTS data dictionary view.

  • Answer: A,C,F

    Explanation:

    Incorrect answers: B, D, E

    Question: 1

    Examine this function:

    CREATE OR REPLACE FUNCTION CALC_PLAYER_AVG

    (V_ID in PLAYER_BAT_STAT.PLAYER_ID%TYPE)

    RETURN NUMBER

    IS

    V_AVG NUMBER;

    BEGIN

    SELECT HITS / AT_BATS

    INTO V_AVG

    FROM PLAYER_BAT_STAT

    WHERE PLAYER_ID = V_ID;

    RETURN (V_AVG);

    END;

    Which statement will successfully invoke this function in SQL *Plus?

    1. SELECT CALC_PLAYER_AVG(PLAYER_ID)
    2. FROM PLAYER_BAT_STAT;

    3. EXECUTE CALC_PLAYER_AVG(31);
    4. CALC_PLAYER(‘RUTH’);
    5. CALC_PLAYER_AVG(31);
    6. START CALC_PLAYER_AVG(31)


    Answer: A

    Explanation:

    A function can be invoked in SELECT Statement provided that the function does not modify any database tables. The function must use positional notation to pass values to the formal parameters. The formal parameters must be of the IN mode. They should return data types acceptable to SQL and they should not include any transaction, session, or system control statements.

    Incorrect Answers:

    B: You can’t call a function in this way, in this way you can call a procedure, because function must return a value, to call a function using EXECUTE command you should declare a bind variable using the VARIABLE command then assign the value returned from the function to this variable, in the following way:SQL> VARIABLE v_get_value NUMBERSQL>

    C: v_get_value := CALC_PLAYER_AVG(31)PL/SQL procedure successfully completed.SQL>

    PRINT v_get_valueV_GET_VALUE———– 1

    Again this way can’t be use for calling a function in PL/SQL block because the function return a value and this values must be assigned to PL/SQL variable or to bind variable. Like this DECLARE

    v_get_from_fn NUMBER; BEGIN v_get_from := CALC_PLAYER_AVG(31); END; /

    D: Same as C.

    E: v_get_value := CALC_PLAYER_AVG(31)PL/SQL procedure successfully completed.SQL>

    PRINT v_get_valueV_GET_VALUE———– 1

    v_get_value := CALC_PLAYER_AVG(31)PL/SQL procedure successfully completed.SQL> PRINT

    v_get_valueV_GET_VALUE———– 1

    v_get_value := CALC_PLAYER_AVG(31)PL/SQL procedure successfully completed.SQL> PRINT

    v_get_valueV_GET_VALUE———– 1

    START is use to execute a script.

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    Question: 5

    Which two statements about packages are true? (Choose two)

    1. Packages can be nested.
    2. You can pass parameters to packages.
    3. A package is loaded into memory each time it is invoked.
    4. The contents of packages can be shared by many applications.
    5. You can achieve information hiding by making package constructs private.


    Answer: D,E

    Explanation:

    Actually theses are some of the advantages of the package, sharing the package among applications and hide the logic of the procedures and function that are inside the package by declaring them in the package header and write the code of these procedures and functions inside the package body.

    Incorrect Answers:

    A: Packages can not be nested

    B: Parameters can’t be passed to a package; parameters can be passed to procedures and functions only.

    C: By the first time you call a procedure, function, or reference a global variable within the package, the whole package will be loaded into the memory and stay there, so when ever you need to reference any of the package’s constructs again you will find it in the memory.

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    Question: 3

    You have created a stored procedure DELETE_TEMP_TABLE that uses dynamic SQL to remove a table in your schema. You have granted the EXECUTE privilege to user A on this procedure. When user A executes the DELETE_TEMP_TABLE procedure, under whose privileges are the operations performed by default?

    1. SYS privileges
    2. Your privileges
    3. Public privileges
    4. User A’s privileges
    5. User A cannot execute your procedure that has dynamic SQL.


    Answer: B

    Explanation:

    When you create a procedure, it will be executed under the privileges of the creator, unless the procedure has the following statement AUTHID CURRENT_USER. If you specify AUTHID CURRENT_USER, the privileges of the current user are checked at run time, and external references are resolved in the schema of the current user. Like this example SQL> CREATE OR REPLACE PROCEDURE delete_temp_table ( v_table varchar2)

    2 AUTHID CURRENT_USER

    3 IS

    4 BEGIN

    5 EXECUTE IMMEDIATE ‘DROP TABLE ‘||V_TABLE;

    6 END;

    7 /

    Procedure created.

    If the procedure is create in this way then the EXECUTE IMMEDIATE statement will be execute under the privilege of the user who executes the procedure, but if we skip line 2 then the procedure will be executed under the privilege of the owner of the procedure.

    Incorrect Answers:

    A: SYS privilege has nothing with is.

    C: What is the public privileges? There is nothing called public privileges.

    D: This will be true if the procedure contains the AUTHID CURRENT_USER.

    E: There is no problem in having a dynamic SQL statement in Procedure.

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    Question: 2

    Which three are true statements about dependent objects? (Choose three)

    1. Invalid objects cannot be described.
    2. An object with status of invalid cannot be a referenced object.
    3. The Oracle server automatically records dependencies among objects.
    4. All schema objects have a status that is recorded in the data dictionary.
    5. You can view whether an object is valid or invalid in the USER_STATUS data dictionary view.
  • You can view whether an object is valid or invalid in the USER_OBJECTS data dictionary view.

  • Answer: A,C,F

    Explanation:

    Incorrect answers: B, D, E

    Question: 1

    Examine this function:

    CREATE OR REPLACE FUNCTION CALC_PLAYER_AVG

    (V_ID in PLAYER_BAT_STAT.PLAYER_ID%TYPE)

    RETURN NUMBER

    IS

    V_AVG NUMBER;

    BEGIN

    SELECT HITS / AT_BATS

    INTO V_AVG

    FROM PLAYER_BAT_STAT

    WHERE PLAYER_ID = V_ID;

    RETURN (V_AVG);

    END;

    Which statement will successfully invoke this function in SQL *Plus?

    1. SELECT CALC_PLAYER_AVG(PLAYER_ID)
    2. FROM PLAYER_BAT_STAT;

    3. EXECUTE CALC_PLAYER_AVG(31);
    4. CALC_PLAYER(‘RUTH’);
    5. CALC_PLAYER_AVG(31);
    6. START CALC_PLAYER_AVG(31)


    Answer: A

    Explanation:

    A function can be invoked in SELECT Statement provided that the function does not modify any database tables. The function must use positional notation to pass values to the formal parameters. The formal parameters must be of the IN mode. They should return data types acceptable to SQL and they should not include any transaction, session, or system control statements.

    Incorrect Answers:

    B: You can’t call a function in this way, in this way you can call a procedure, because function must return a value, to call a function using EXECUTE command you should declare a bind variable using the VARIABLE command then assign the value returned from the function to this variable, in the following way:SQL> VARIABLE v_get_value NUMBERSQL>

    C: v_get_value := CALC_PLAYER_AVG(31)PL/SQL procedure successfully completed.SQL>

    PRINT v_get_valueV_GET_VALUE———– 1

    Again this way can’t be use for calling a function in PL/SQL block because the function return a value and this values must be assigned to PL/SQL variable or to bind variable. Like this DECLARE

    v_get_from_fn NUMBER; BEGIN v_get_from := CALC_PLAYER_AVG(31); END; /

    D: Same as C.

    E: v_get_value := CALC_PLAYER_AVG(31)PL/SQL procedure successfully completed.SQL>

    PRINT v_get_valueV_GET_VALUE———– 1

    v_get_value := CALC_PLAYER_AVG(31)PL/SQL procedure successfully completed.SQL> PRINT

    v_get_valueV_GET_VALUE———– 1

    v_get_value := CALC_PLAYER_AVG(31)PL/SQL procedure successfully completed.SQL> PRINT

    v_get_valueV_GET_VALUE———– 1

    START is use to execute a script.