Select single for update not creating lock on entry

Hi All,
I want to update an entry from MARA table so what ii did is
select single for update *   from mara where matnr = 'ZYS'.
The for update is supposed to create a lock for me and the the lock is released after the commit or roll back.
I'm running this prg in debug mode and after the statment
select single for update *   from mara where matnr = 'ZYS''.
I opened MM02 for this material and could change the data which i'm not supposed to be as there is lock on this particular mater from single for update statemnt
or
I even tried from other program
select single *   from mara where matnr = 'ZYS'. in debug mode and it returned a sy-subrc eq 0.
and i don't see a lock in SM12 FOR SELECT * FOR UPDATE.....
Can anyone clarify on this
Thanks
David

Hi All,
I knew we can create a lock object but thought to give a shot without creating lock object.
So i'm just curious to know when we can use select * for update
F1 Help says select * for update creates an E type lock- which will prevent other locks(X AND S type locks) overwriting or even reading that entry
Also ,
can someone throw some light DB lock and SAP Lock ( is this same as SAP LUW and DB LUW)
Thanks
David

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Use of SELECT SINGLE FOR UPDATE

Hello,
Am I missing something with FOR UPDATE addition in Open SQL? When I use it I can't get a lock to appear to SM12. For example, if I select a single record for update from table EKKO it's still possible to effect a normal MEPO update of the releavnt purchase order even before a COMMIT WORK command in my code.
Any ideas?
Thanks,
Chris.

Hello Chris
FOR UPDATE command creates only a database lock,
you can't see database locks in sm12.
You should use related "lock object" to lock entries in table EKKO with sm12
For finding the lock object follow steps below :
- Go to transaction se11
- Write your table EKKO
- Click button : Where Used List
- Choose only "Lock object" in the next popup screen
Every lock object has two function module ENQUEUE_<LOCK OBJ NAME> and DEQUEUE_<LOCK OBJ NAME>
enqueue function creates lock in sm12 and dequeue deletes lock entry from sm12.
And you can display parameters from se37 and use it.
I hope it helps.

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My JDBC code uses "select for update" to modify record in Oracle database. I tried to simulate network connection down situation.
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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.
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SINGLE FOR UPDATE

Hi,
can anybody tell me the user of "SINGLE FOR UPDATE" keywords in SELECT statement?
Priya

As given by SAP -
... SINGLE [FOR UPDATE]
If SINGLE is specified, the resulting set has a single line. If the remaining additions to the SELECT command select more than one line from the database, the first line that is found is entered into the resulting set. The data objects specified after INTO may not be internal tables, and the APPENDING addition may not be used. The addition ORDER BY can also not be used.
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LOCK - Lock protected data from being accessed by several users at the same time as a shared lock or as exclusive locks
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Reward all helpful replies.

When should SELECT ..FOR UPDATE be used?

DB Version:10gR2
This is what 10gR2 PL/SQL documentation says about SELECT...FOR UPDATE
With the SELECT FOR UPDATE statement, you can explicitly lock specific rows of a
table to make sure they do not change after you have read them. That way, you
can check which or how many rows will be affected by an UPDATE or DELETE
statement before issuing the statement, and no other application can change the
rows in the meantime
But i don't see SELECT...FOR UPDATE much in our production codes. Is SELECT ..FOR UPDATE used when huge amount of rows need to be updated?

Its maily used for locking table with differnt node , commely this concpet where used in
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before that read this
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Parent could not create lock ???

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I have tried for about 10 hours! 
 
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Great thanks. 

Hello,
Make that you remove any existing var/run/apache2/accept.lock file before restarting Apache.
If var/run/apache2/accept.lock is not created after you start Apache, then experiment with different locations for this file.
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WL Server & apache 2 integration: mod_weblogic: could not create lock

Hi,
we're running Apache 2.0.50 as a front-end for WL Server 8.1 using mod_weblogic as the proxy.
We have to run Apache as a different user than the default LocalSystem account to be able to access a windows share. But when we set up Apache to run as a user (in the windows domain) the server will not start up. Looking at the error log I can see the following message:
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When I have the following line in my httpd.conf file:
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Error occuring in SELECT statement FOR UPDATE when using WITH cluase

Hi,
Iam using oracle 11g version
Iam having a query with fetch records for update insid with cluase as
cursor c1 is
With abc as (
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for update of <col1> skip locked
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Select single for update not creating lock on entry

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