RE: Close cursor to release lock?

Hi,
I don't think you will need to release the cursor before the update,
otherwise the cursor will be rendered useless.
Regards,
Peter Sham.
-----Original Message-----
From: Phong Tran [SMTP:[email protected]]
Sent: Monday, March 22, 1999 12:49 PM
To: [email protected]
Subject:
Dear fellow users,
Following is a simple code showing the use of cursor "cCursor"
which
contains clause "for update of col_name". The RDBMS used is SQL
SERVER 6.5.
The "sql open cursor cCursor ..." supposes to lock the row for
update.
Since ODBC does not support positioned update with clause "where
current
of cCursor", I am not sure if you have to close the cursor to
release the
lock before updating with the "sql update ..." statement within the
same
transaction, or no need to close it before issue the satement.
Any helps 'd be appreciated.
Regards
Phong
cursor definition for CustCursor:
select c_balance,c_ytd_payment, c_delivery_cnt ,
from customer
where c_id = :cId and c_d_id = :cDId and c_w_id = :cWId
for update of c_balance, c_delivery_cnt
begin transaction
cCursor: CustCursor;
sql open cursor cCursor(custObj.c_id, dId, wID) on session
DBConnect;
sql fetch cursor cCursor into :custObj;
// update c_balance, c_delivery_cnt in customer using
custObj.
// can update while the cursor lock is on this curtomer.
// ODBC does not support positioned update.
// close cursor first then update.
sql close cursor cCursor;
sql update customer set c_balance = :custObj.c_balance,
where c_id = :custObj.c_id AND c_d_id = :dId AND c_w_id =
:wId
on session DBCOnnect;
end transaction;
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Hi Mohit,
check this thread if you want to release lock in web ui by coding..
Transaction in Edit mode - Unlock transaction
Hope this helps..
Cheers,
Sumit Mittal

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Raf Serrano wrote:
Hi,
I am a new member of this forum. I am working with a problem we got a few weeks ago. It is from a Pro C batch executable running on 10 threads dealing with >800 data accessed from multiple tables. The error as reported came from a package.function call.
This is the error I encountered:
process_item~G****, D***~-60~ORA-00060: deadlock detected while waiting for resource~PACKAGE ERROR = CLOSE cursor C_***** in package R***.I*** 7641
The cursor is a simple SELECT cursor without Table or Record locking.
My questions are:
*Upon the occurrence of this error, is the execution already at the CLOSE cursor line or did the error occurred between the OPEN cursor and the CLOSE cursor? There are several lines of code in between OPEN and CLOSE:
- one that calls for a package.function that simply stores parameter values to a variable
- another one which fetches the cursor. The group that holds the cursor values is only used by a single function in the package
*Is it possible for this CLOSE cursor to cause a deadlock? What could have caused this?
*From what I know, Oracle deals with deadlocks by aborting the deadlocking process while others continue, but this deadlock caused our program to hang. How is this possible? Could the root cause of the deadlock be from our threading program? This is a rare occurrence and happened only twice this year.
Thanks,
RafSELECT (without FOR UPDATE) statements are never involved in ORA-00060.
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RE: Close cursor to release lock?

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