Releasing lock on closing NWBC

Hi..
I am locking a object when it is edited, when i close the browser i am able to release lock on the object.
But the same lock is not released when i close the NWBC without saving.
How to handle this in webdynpro whenthe application is exited abnormally in case of NWBC.
Please give your valuable inputs.
thanks
Vimal.

Same problem here with he.net, my ISP. Apple's iPhone Mail.app has a clear bug here. I am unable to check my mail from my desktop for near 5 minutes or so after accessing it on the iPhone. Very annoying.

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Oracle select for update: not releasing lock

My JDBC code uses "select for update" to modify record in Oracle database. I tried to simulate network connection down situation.
After my JDBC code locked on a record using "select for update", I unplugged the network cable. I then tried to run the same code on another computer, but it could not accquire the lock, because the previous lock was not released. I tried sqlplus to lock the record, but failed also. The lock has been there for at least an hour now. I guess it may finally be released, but is there a way for oracle to release the lock as soon as the connection is down? Not know if it is a JDBC setting or oracle setting.

Dear Friend,
What you are trying to do is not correct way of checking the concurrency and transaction.
The reason is as listed below.
01.Always remember http is a stateless protocol and removing the connection or just closing the browser will never be informed to the database or to the application server thus the transaction monitor (TM)or processor will never release the lock as it will deem that the actor is manipulating the data.
02.As per locking goes every database is having a �TM� and the default isolation level setting is different like oracle uses serializable DB2udb 7.0 or db2/As400 uses repeatable read. You can change this setting by editing the default setting in the database but be very sure before touching it.
03. You can also transpose this with your Application server setting for that piece of code or Globally but again be very sure about it as it will change the entire gamete.
04. For releasing lock you have to manually do it or you can change the settings of App server or the Database to release the connection after some wait time.
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Ruchir

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Hi,
I am trying to import an mdl file in the test enviroment from the development environment.
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I start importing the mdl file.
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Module pool - MP007740
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PS Touch Android does not release memory when closed.

I have to force closure with Task Manager on my Samsung Note 2 running JB 4.1. Why and when will it be fixed?

Hi Ignacio,
Sorry for the lack of information - I had typed more complete description, but had trouble posting it.
The app is installed on a Samsung Galaxy Note 2 phone that is running Jellybean 4.1.1.
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With both these apps, I have to go to the "Active Apps" tab of the Task Manager to release memory.
There is one difference with PS Touch. Google Chrome always starts the same way whether or not I release it's memory. With PS Touch, if I release memory after closing with the back key, the next time I start it I get an initial royal blue screen with the PS Touch icon in the middle followed by a second screen with a menu in the middle titled "New Project From". If I exit at that point, it takes two presses of the back key to first close the menu and then exit the program and return to a home screen. If I do not release memory, the next time I start PS Touch, it goes directly to the second screen, but without the "New Project From" menu.
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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.
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-----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;
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive
<URL:http://pinehurst.sageit.com/listarchive/>
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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

URGENT : Releasing locks aquired after the session ubruptly terminated

Hi everybody,
When a record is edited the record gets locked.
If the session is ubruptly terminated (PC switched off, Network down or something like that) before the edited record is commited or rolled back and if the same record is accessed after loging on once agian "Cannot reserve record " message is displayed.
When will such locks get released?
Is there any way to make the record editable (releasing locks programatically)?
Thanks
Brijesh

The old session should clean up given time - How, depends of course if this is a Client Server Form or a Web Deployed Form.
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How to release lock for TP?

Hi,
can any one pls tell me how to release lock for TP

Hey Raja
Can you be more specific of what is TP?
Btw, there is a transaction called SM12 where we can lock unlock entries of table or transactions. Check if that can help.
Kind Regards
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Pr& po -new release strategy? released/locked/incomplete

Dear MM experts,
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locked
incomplete
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Is it possible to keep on locking tables after COMMIT is
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I am now writing a batch program to TRUNCATE and INSERT records
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is inserted (and the last INSERT, of course). However, I
remember COMMIT will also release lock on the working table.
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Release Locks - SM12 - DEQUEUE

I would like to programmatically be able to release locks from SM12. I will potentially have locks set on lock object ERSPLS_LOCK (table RSPLS_S_LOCK). I know majority of you will say this is bad practice, but I really have a business need for this, and would like to avoid the lengthy explanation.
I found the function module DEQUEUE_ERSPLS_LOCK which seems to be created for this purpose, but I cannot figure it out. Can anyone please explain the settings, or supply another FM or program that can release locks based on a certain InfoProvider?
Here are the Function Module selection options with their defaults:
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INFOPROV
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LINE
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Table: RSPLS_S_LOCK
Lock Argument: 010GLPFCST                      4989B89EB53D0057...... (about 128 characters long, only the first 10 are similar with the rest)
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Thanks!

Hi,
Ccheck the below link:
http://help.sap.com/saphelp_nw04/helpdata/en/7e/c025bbf011d140bdb22b196208817e/frameset.htm
Reg
Pra

Release lock record

hi everybody,
i want to know how can i release lock record? is there any setting in application server to do this?
thanks a lot

Hi
Please give some more information as your question does not seem to be complete.
Are you talking about Operating system lock or database lock .
Please provide the correct release you are currently using .
Regards
Sadiq

Lock not always released if browser closed in edit mode.

We have had a few instances in the last couple weeks (since deployment of an I.P. application) where a user has either closed the browser while in edit mode, or received some sort of error when saving plan data and the browser closed, where the Lock in RSPLSE/SM12 was not deleted. In the last case, the lock stayed for 6 hours before we were notified to manually delete the lock. The user had closed all windows, even restarted her machine.
Any insight on how to enforce removal of locks if browser is closed? We are on SAPKW70017 and BI Java Support Package Patch SP015

Hi Cote,
this is a frequently discussed topic. Usually the lock should be released, the session should be closed etc at the time closing a window.
One idea for this one: Does a small popup window appear when you close your browser? If the users have activated the popup blocker this will cause problems because the locks and sessions can not be released. Also it might cause problems using other browsers than IE...
Good luck.
Brgds,
Marcel

Locking in EntityFramework - calling empty stored procedure releases lock acquired using sp_getapplock

I have a patient table in the SQL Server database. Clients connect to the database and checkout one of the patients and do some operations on it and save it afterwards.
Since multiple clients might access the patient at the same time. I wanted to implement pessimistic locking mechanism, So that if one client can acquire a lock to a particular patient at a time.
Also if one of the clients locks a particular patient and either crashes or closes the client application the lock should be released. In case of crash the lock should be released when we detect that the connection of client with the database is closed.
I found out that I could use sp_getapplock and sp_releaseapplock to
do achieve this and specify @LockOwner
= 'Session' when calling sp_getapplock,
this ensures that the lock is released once the database session with the client closes.
From the code, I call a stored procedure in database to acquire the lock. This acquires the lock correctly and if i close off the client app or the client app crashes the lock is released. This is behaving as I wanted it to.
The problem happens when I call another stored procedure which is supposed to release the lock. As soon as the stored procedure is entered the lock is released, before we even execute sp_releaseapplock
@patientId, @LockOwner = 'Session' the line which is actually supposed to release the lock.
I tried creating an empty stored procedure (just commented out
DECLARE @result int
EXEC @result = sp_releaseapplock @patientId, @LockOwner = 'Session'
This stored procedure still releases the lock I acquired using sp_getapplock.
I can't seem to understand why this is happening. It should only release when I explicitly call `sp_releaseapplock @patientId, @LockOwner = 'Session'``
CREATE PROCEDURE [dbo].[uspReleaseAppLock]
@patientId nvarchar(max), -- Patient ID
@ReturnValue int Output
AS
BEGIN
DECLARE @result int
EXEC @result = sp_releaseapplock @patientId, @LockOwner = 'Session'
SET @ReturnValue = @@SPID
END
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for each call to the stored procedure. Something else is going on which I am not able to comprehend. Any ideas ?

Hi oalvi,
The Stored Procedure(SP) sp_getApplock initialed with "@LockOwner='Session'" is
session scoped. Your procedure
[dbo].[uspReleaseAppLock]
did the same work as you explicitly call "sp_releaseapplock @Resource = @patientId, @LockOwner='Session'", after the SP
uspReleaseAppLock
called or the current session ends, the lock released.
It doesn't make sense to call the uspReleaseAppLock to release the lock initialized in another session. If you try, you get the error like below, as I mentioned, the lock is session scoped.
"Cannot release the application lock (Database Principal: 'public', Resource: 'patient1') because it is not currently
held"
Regarding the same session ID you get from calling 2 SPs separately in Entity Framework(EF). As per my limitation knowledge on EF, If the maxsize of the project connection
pool equals 1, you may get the same session always.
Some cautions for sp_getApplock
Locks can be explicitly released with sp_releaseapplock. When an application calls sp_getapplock multiple times for the same lock resource, sp_releaseapplock must be called the same number of times to release the lock.
Due to the connection pool, the sessions may last long, that's what you need to take into account.
By the way, is there any reason that you have to use the sp_getApplock? What is the procedure doing that you cannot rely on SQL Servers build-in concurrency control mechanisms?
If you have any question, feel free to let me know.
Eric Zhang
TechNet Community Support

Releasing lock on closing NWBC

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