read plsqlchallenge question of coherence

Hi Experts,

Today, I saw a good question in reading consistency plsqlchallange.com I want to share with you. The interesting thing is, I thought that the cursor may receive prior to extraction. However, he said that it can be extracted when cursor connection occur. Is she not devoid of meaning? Because there is also a keyword called FETCH, if the cursor to retrieve data, so why we use the FETCH keyword too?

My second question is, as far as I know in FOR extraction of cursor loop 100 lines for each iteration. As opposed to simple loop. I wonder if Oracle does not have the functionality of reading consistency, will be the display still loop the same result because it gets 100 lines per iteration?

I create and populate a table as follows:
CREATE TABLE plch_employees
(
employee_id INTEGER
, last_name VARCHAR2 (100)
Number of salary
)
/

BEGIN
INSERT INTO plch_employees
VALUES (100, 'Smith', 100000);

INSERT INTO plch_employees
VALUES (200, "Jones", 1000000);

COMMIT;
END;
/
Blocks leading to the following two lines of text to display after running?
Smith
Jones

BEGIN

FOR SheikYerbouti IN (SELECT *)

OF plch_employees

ORDER BY employee_id)

LOOP

DELETE FROM plch_employees;

Dbms_output.put_line (emp_rec.last_name);

END LOOP;

END;

DECLARE
CURSOR emps_cur
IS
SELECT * from plch_employees
ORDER BY employe_id;

SheikYerbouti emps_cur % ROWTYPE;
BEGIN
OPEN emps_cur.
DELETE FROM plch_employees;

LOOP
GET emps_cur INTO SheikYerbouti.
EXIT WHEN emps_cur % NOTFOUND;

Dbms_output.put_line (emp_rec.last_name);
END LOOP;
CLOSE Emps_cur;
END;

Concerning

Charlie

Robert Angel wrote:

Open cursor creates your snapshot that is consistent and is used by any code from there.

Common misperseption opening cursor creates a snapshot. Is not! Opening slider simply records current SNA which becomes the reference point of read-consistency level statement. When the extraction is issued it read table and check the SNA of each block. If block YVERT > open cursor Oracle YVERT realize block changed since the cursor was opened, and will go to CANCEL to the previous status of block. He will check that previous state of block SNA and if it is new > open cursor YVERT repeats the process. Finally he will find either block consistent state in UNDO or trigger of"snapshot too old".

SY.

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