Yes, using WHERE CURRENT OF is faster. It is the same as saying "WHERE rowid
= emprec.rowid", just more readable. And accesses by rowid are faster than
index accesses.
Also, what happens if you don't have a unique or primary constraint on the
table and whole rows can be duplicated? Then you pretty much need to use
WHERE CURRENT OF.
HTH
Kevin
-----Original Message-----
Sent: Friday, July 11, 2003 2:54 PM
To: Multiple recipients of list ORACLE-L
Could anyone give us an idea as to the full usefullness
of CURRENT OF? Here are my two separate examples:
/* 1 this one has a CURRENT OF */
DECLARE
CURSOR EmpCursor IS
SELECT *
FROM Emp
FOR UPDATE;
BEGIN
FOR EmpRec IN EmpCursor LOOP
UPDATE EMP
SET SALARY = SALARY * 1.08
WHERE CURRENT OF EmpCursor
END LOOP;
END;
/* 2 same as above, except without the CURRENT OF */
DECLARE
CURSOR EmpCursor IS
SELECT *
FROM Emp
FOR UPDATE;
BEGIN
FOR EmpRec IN EmpCursor LOOP
UPDATE EMP
SET SALARY = SALARY * 1.08
WHERE EMP_ID = EmpRec.Emp_ID;
END LOOP;
END;
/
Is one more efficient than the other? If I could have done
business without the CURRENT OF, then why did oracle made
it available?
thx
maa
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