5  2257 
Hi, serge.
Lots of "old table", "new table" function.
Where is the original definition of those stuff?
Serge Rielau <sr*****@ca.ibm .com> wrote in message news:<30******* ******@uni-berlin.de>... Contains a major blurp on SELECT FROM INSERT and some other hopefully
useful tricks.
http://www-106.ibm.com/developerwork...dm-0411rielau/
Enjoy
Serge
Serge,
it is very interesting, thanks.
One thing about Delivery table function is not clear to me.
I don't understand if deadlocks are ever possible when calling the
function simultaneously from several connections.
Can you explain please?
AK wrote: Serge,
it is very interesting, thanks.
One thing about Delivery table function is not clear to me.
I don't understand if deadlocks are ever possible when calling the
function simultaneously from several connections.
Can you explain please?
There are no deadlocks possible (anymore).
Without SELECT FROM DELETE however the code would have to look like this:
SET VAR_O_ID
= (SELECT MIN(NO_O_ID)
FROM NEW_ORDER
WHERE NO_W_ID = DEL.W_ID
AND NO_D_ID = DEL.D_ID);
DELETE FROM NEW_ORDER
WHERE NO_O_ID = VAR_O_ID;
Since there is more than one delivery "daemon" chances are that two of
them will try to delete the same order.
Both will get a S lock on MIN(NO_O_ID) which they try to upgrade to an
exclusive lock.. and that would be the end.
Multiple solutions are thinkable involving at 2 SQL statements:
WITH RR USE AND KEEP EXCLUSIVE LOCKS will get the lock right away.
Using a cursor FOR UPDATE (over the ORDER BY) will position the row so a
DELETE WHERE CUURRENT OF can operate on it.
Cheers
Serge This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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