SELECT... FOR the vs LOCK TABLE of UPDATE... MODE OF LINE SHARING IN
HelloIn practice, what is the difference between the two versions of line locking methods...?
In my case, I need to block only the lines that will be extracted by a cursor... but because the select stmt using the sum aggregate function... I can't use the format:
cursor c1So, the only alternative I have (I think) is the "LOCK TABLE d PART of the LINE in MODE.
is
select x , y ,sum(a)
from d
group by x,y
for update;
Is the above correct... to obtain row locks the same as the "select" for the update?
Note: I use Db10g v.2
Thank you
SIM
When you draw a select... Updated, it's immediately another session in standby mode until you release the lock.
TABLE LOCK is a bit different, the other session will run in standby mode after an UPDATE statement. If the other session, run an UPDATE statement before your own session, you will wait for the release lock.
So, it's different behaviors. Conclusion: they are not same.
Nicolas.
Tags: Database
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