Lock On the table

Dear All,
I m using oracle 10g r2 on windows.
I just have doubt that if i update a table by merging (MERGE) and will not commit for hours.
What will happen in this case if i commit after 10 hours.
will it rollback or get commit.
Thanks.

861329 wrote:
Dear All,
I m using oracle 10g r2 on windows.
I just have doubt that if i update a table by merging (MERGE) and will not commit for hours.
What will happen in this case if i commit after 10 hours.
will it rollback or get commit.
Thanks.If the session is active then your COMMIT will work. But lets say if you have set your IDLE_TIME as 2 Hours and you come and issue a COMMIT after 10 Hours then The session will be disconnected and your session will go away from v$session. In that case your transaction is ROLLBACKed.
So in general its advised to end your transaction with a COMMIT or ROLLBACK immediatly. Why wait for 10 Hours?

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Lock's the table

hi,
I have update statement like
Update table_name a
set sal =
     (select sal
     from sal_table b
     where a.empno = b.emp_no);
when, i run this statement, it takes near by 20 minutes.
and upto that time it lock's the table.
Is it possible, i run same statement and at that i use dml statement on that?
Please, help...

Do you really need to update every row of TABLE_NAME? My guess is that you want a WHERE clause, i.e.
Update table_name a
   set sal =
    (select sal
      from sal_table b
     where a.empno = b.emp_no)
where exists
    (select 1
       from sal_table b
      where a.empno = b.emp_no
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Justin

Locking & Unlocking the tables

I am locking one z-table in a module pool.
i have one more FM in which i will have to delete all entries of this table first and then create new entries into the same table.
So I used ENQUEUE_E_TABLE to lock the table while the transaction runs with E mode.
issue:
on-site cordinator could not create entries in that z-table using FM when the transaction is running. Sounds resonable but when am testing, i could create entries. How is this possible.
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Kiran

Hi,
In order to fulfil your requirements I would suggest the following:
Move the call to ENQUEUE_TABLE into your FM and add an exception of type, e. g. TABLE_LOCKED to the FM interface.
In your FM call ENQUEUE_TABLE and check sy-subrc. If it is greater than 0 raise the exception TABLE_LOCKED. Otherwise update the table as required.
In your application coding call the FM and check for the exception. Report an error if the exception was raised. After the FM call either call DEQUEUE_TABLE or COMMIT WORK to release the lock. You might also do this in the FM - the decision depends on whether the FM will be called from other programs as well, whether you will later call the FM IN UPDATE TASK etc. Just be shure to release the lock somewehere...
At least that's how I would do it (your mileage may vary
Hope this helps (please reward me if it does).
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How to find out the locks in the table

Any query anybody have to find out locks in any table.

Here is a version with SID and serial# data:
set linesize 150;
set head on;
col sid_serial form a13
col ora_user for a15;
col object_name for a35;
col object_type for a10;
col lock_mode for a15;
col last_ddl for a8;
col status for a10;
break on sid_serial;
SELECT l.session_id||','||v.serial# sid_serial,
       l.ORACLE_USERNAME ora_user,
       o.object_name,
       o.object_type,
       DECODE(l.locked_mode,
          0, 'None',
          1, 'Null',
          2, 'Row-S (SS)',
          3, 'Row-X (SX)',
          4, 'Share',
          5, 'S/Row-X (SSX)',
          6, 'Exclusive',
          TO_CHAR(l.locked_mode)
       ) lock_mode,
       o.status,
       to_char(o.last_ddl_time,'dd.mm.yy') last_ddl
FROM dba_objects o, gv$locked_object l, v$session v
WHERE o.object_id = l.object_id
      and l.SESSION_ID=v.sid
order by 2,3;

FM to lock the Table

Could anybody check and tell me whether Function Module ENQUEUE_E_TABLE
and DEQUEUE_E_TABLE are working fine and if it is so let me know the Parameters used for it.
Full reward points for issue solver.
Regards,
Amol

hi..
check out the following documentation
Lock objects are used to lock the database table while making the modifications on the database table.
you can create your own lock objects using SE11.
if you create lock objects on any table system will create two function modules.
1.ENQUEUE....
2.DEQUEUE.....
first one is used to lock the table
second one used to removing lock on the table.
lock Table
CALL FUNCTION 'ENQUEUE_E_TABLE'
EXPORTING
tabname = table_name
EXCEPTIONS
foreign_lock = 1
system_failure = 2
OTHERS = 3.
Unlock Table
CALL FUNCTION 'DEQUEUE_E_TABLE'
EXPORTING
tabname = table_name
check this link :
http://help.sap.com/saphelp_40b/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
_SCOPE = 1: The lock is not sent to the update program. The lock is removed when the transaction is ended.
_SCOPE = 2: The lock is sent to the update program. The update program is responsible for removing the lock. The dialog program which requested the lock no longer has an influence on the lock behavior. This is the standard setting for the ENQUEUE function module.
_SCOPE = 3: The lock
Re: lock objects
Managingin lock entries
http://help.sap.com/saphelp_nw04/helpdata/en/37/a2e3ae344411d3acb00000e83539c3/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/7b/f9813712f7434be10000009b38f8cf/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/cb/168237d30d974be10000009b38f8cf/frameset.htm
Reward points if useful
Regards
Ashu

How can we lock the table?? how can we lock the record

Hi
how can we lock the complete table?? how can we lock the record ?/
Thanks
Rama

Lock objects are used to lock the database table while making the modifications on the database table.
you can create your own lock objects using SE11.
if you create lock objects on any table system will create two function modules.
1.ENQUEUE....
2.DEQUEUE.....
first one is used to lock the table
second one used to removing lock on the table.
lock Table
CALL FUNCTION 'ENQUEUE_E_TABLE'
EXPORTING
tabname = table_name
EXCEPTIONS
foreign_lock = 1
system_failure = 2
OTHERS = 3.
Unlock Table
CALL FUNCTION 'DEQUEUE_E_TABLE'
EXPORTING
tabname = table_name
check this link :
http://help.sap.com/saphelp_40b/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
_SCOPE = 1: The lock is not sent to the update program. The lock is removed when the transaction is ended.
_SCOPE = 2: The lock is sent to the update program. The update program is responsible for removing the lock. The dialog program which requested the lock no longer has an influence on the lock behavior. This is the standard setting for the ENQUEUE function module.
_SCOPE = 3: The lock
Re: lock objects
Reward if this helps.

To find the table lock

Hi
When i try to update a able it is locked.
May i know how to find out by whom was the lock created.
Thanks in advance
Mary

No that's not possible, because Oracle doesn't keep track of all the individual locks. Oracle doesn't have a lock manager and they are not a scarce resource in Oracle.
There are two thing you can do, although both are probably not what you want:
1) Examine the table locks, and if there is only one on the table you are working with, you have a chance that the session you find is the one you are looking for. But this is only true when the lock is held for quite some time. Otherwise you risk the situation that the session you were interested in, has released the lock and a new session has a new lock on the table. So handle with care.
2) When your session is waiting for a lock, there will be a record in v$lock. Use a third session to examine which session is holding the lock.
Regards,
Rob.

UL type lock on a table blocking all other users

Hi,
We have a referential integrity constraint on a version enabled table, that refers to a non-version enabled table (highly active table..lots of inserts/updates). An insert into the version enabled table is causing a UL type lock and the non-versioned table is locked (literally the table is inaccessible) and we see blocking locks. How can I avoid this situation? Is there any OWM settings that will help me resolve this issue? I am using workspace manager version 10.2.0.4.2.
Thanks.

Hi,
An insert into a child table requires a lock on the parent table which will block updates and deletes into its parent table(s) until the lock is released. This is done to maintain the validity of the constraint. Otherwise, it would be possible to have child rows without parents, which we obviously need to prevent from happening.
If possible, you could commit/rollback the transaction involving the child table more frequently, so that the locks are released and dmls can proceed on the parent table.
You can also take a look at the following thread.
RIC in OWM - ORA-20171 deadlock detected ...
It is specifically referring to deadlock situations, but it also explains our locking behavior for RIC tables.
Regards,
Ben

Monitor exclusive lock on a table and send notification email through EM

Hi,
I have Oracle10g and EM10G running on different servers.
now one of my plsql code creates an exclusive lock on one of my tables.
i want to monitor this exclusive lock on this table through the EM. and when the exclusive lock on the table is continuing for more than 1 hour, i want an email notification sent to me by the EM.
How can i do this?
Can someone help me achieve this above situation.
Thanks.
Philip.

One of the nice about OEM is that a lot of the things are self explanatory. E.g. I never read docs to set up our first user defined metrics. It is really just to dive in there. Define a metric and the sql you want to use for monitoring the lock. Then you just go and create email notification for this when it hits warning or critical treshold.

How we can lock No more than one user can use the table at a single time

Hi Abapers,
0) which function modules to lock & unlock a table.
1) When you execute the program, we can check if there is any lock on this table. If yes, the user should be able to only view the table contents and not modify.
2) If there is no lock, then lock the table and go into change mode.
3) On exiting from the program, unlock the table using the function module.
4) more than one user can't modify the table just display.
Note: If there is any lock, display message saying table is locked.
Plz help me for this requirement.
Thanks
Nani

Hello Nani
Have a look at the lock object EMMARAE (Lock MARA and MARM/MAKT exclusively) in transaction SE11.
Inspect the F1 help for field Lock mode:
DE ENQMODE
Short Text
 Lock mode
Definition
 Defines how to synchronize table record access by several users.
The following modes exist:
 Exclusive lock
 The locked data can be read or processed by one user only. A request
 for another exclusive lock or for a shared lock is rejected.
 Shared lock
 Several users can read the same data at the same time, but as soon
 as a user edits the data, a second user can no longer access this
 data. Requests for further shared locks are accepted, even if they
 are issued by different users, but exclusive locks are rejected.
 Exclusive but not cumulative lock
 Exclusive locks can be requested by the same transaction more than
 once and handled successively, but an exclusive but not cumulative
 lock can only be requested once by a given transaction. All other
 lock requests are rejected.
If you want to lock a standard table search whether the table is used in lock objects (Where-Used-List). If it is a customer table you have to create your own lock object (including two function modules: one for enqueuing and the other for dequeuing).
The lock modules can be found in menu GoTo -> Lock Modules.
Given these lock modules the logic should be quite clear after starting the program:
1. Request lock -> if successful, continue in Change mode; -> if failed, continue in Display mode
2. Before leaving the report remove lock (note: no problem if no lock has been set in the beginning).
Regards
Uwe

How can I lock a table so that a person can only enter data, not manipulate the table?

I don't want to Lock the table as Numbers does it so perhaps locking is the wrong term. What I want to do is to lock the formatting of the table so it is possible to enter data but not possible to change the position, number of columns etc. I've been searching and all I can come up with is the regular lock function. But I still want to be able to use the cells. Just not change formatting.
Thanks, Brad

you cannot. When you lock a table the whole table is locked. I would consider segmenting the user input into a seprate, un-locked table and placing the calculations in a locked table

Lock Object (Not locking the table)

Hi Guys
I have a custom table ZDRAD same like standard table DRAD with an additional 'DATE' field . ZDRAD's Key fields are same like DRAD . I have created a lock object 'EZDRAD' where I put name = 'ZDRAD' (Custom table) and mode = 'EXCLUSIVE CUMULATIVE' . Now I want to lock the table(Whole table) before modifying/Inserting/deleting the records in se38. Please check the code below and suggest me if I am passing wrong values to the lock object Function module.
Code
TABLES : ZDRAD.
CALL FUNCTION 'ENQUEUE_EZDRAD'
EXPORTING
 MODE_ZDRAD = 'E'
 MANDT = SY-MANDT
 DOKAR = ' '
 DOKNR = ' '
 DOKVR = ' '
 DOKTL = ' '
 DOKOB = ' '
 OBZAE = 0
 OBJKY = ' '
 X_DOKAR = ' '
 X_DOKNR = ' '
 X_DOKVR = ' '
 X_DOKTL = ' '
 X_DOKOB = ' '
 X_OBZAE = ' '
 X_OBJKY = ' '
 _SCOPE = '2'
 _WAIT = 'X'
 _COLLECT = ' '
EXCEPTIONS
 FOREIGN_LOCK = 1
 SYSTEM_FAILURE = 2
 OTHERS = 3
*IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
 WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
*ENDIF.
IF SY-SUBRC = 0.
ZDRAD table is locked.
 P_L_LOCK_STAT = 'X'.
 EXIT.
ELSE.
ZDRAD table is not locked
 CLEAR P_L_LOCK_STAT .
ENDIF.

Hi Kanthimathi
That is numeric field . Please suggest me how can i check the lock.

Get the table's rowid of the session that is locking in RAC database

I am a developer and not a DBA and I need to find th correct query to find the exact rowid of the record locked on a table. This is for a RAC database and locked record can be from the web form in oracle application server. When I try to get the correct row id, I get the following error:
ORA-01410 - Invalid row id
For the criteria, the output is Dbms_Rowid.rowid_create(1, -1, 36, 7845, 0), why I get a -1 for the ROW_WAIT_OBJ#?
Additional Information: The lock type is DML and the lock mode is: Row Exclusive, the table is locked and the program is web oracle forms executiong.
I am executing the query in Oracle Database 11g Enterprise Edition Release 11.1.0.7.0
How to accomplish gettting the correct rowid? Below is the selection criteria I have:
select vs.inst_id,
vs.audsid audsid,
locks.sid sid,
locks.type,
locks.id1 id1,
locks.id2 id2,
locks.lmode lmode,
locks.request request,
locks.ctime ctime,
locks.block block,
vs.serial# serial#,
vs.username oracle_user,
vs.osuser os_user,
vs.program program,
vs.module module,
vs.action action,
vs.process process,
decode(locks.lmode,
0, '0 None',
1, '1 NULL',
2, '2 Row Share',
3, '3 Row Exclusive',
4, '4 Share',
5, '5 Share Row Exclusive',
6, '6 Exclusive', '?') lock_mode_held,
decode(locks.request,
0, '0 None',
1, '1 NULL',
2, '2 Row Share',
3, '3 Row Exclusive',
4, '4 Share',
5, '5 Share Row Exclusive',
6, '6 Exclusive', '?') lock_mode_requested,
decode(locks.type,
'MR', 'Media Recovery',
'RT', 'Redo Thread',
'UN', 'User Name',
'TX', 'Transaction',
'TM', 'DML',
'UL', 'PL/SQL User Lock',
'DX', 'Distributed Xaction',
'CF', 'Control File',
'IS', 'Instance State',
'FS', 'File Set',
'IR', 'Instance Recovery',
'ST', 'Disk Space Transaction',
'TS', 'Temp Segment',
'IV', 'Library Cache Invalidation',
'LS', 'Log Start or Log Switch',
'RW', 'Row Wait',
'SQ', 'Sequence Number',
'TE', 'Extend Table',
'TT', 'Temp Table',
locks.type) lock_type,
vs.row_wait_obj# row_wait_obj#,
vs.row_wait_file# row_wait_file,
vs.row_wait_block# row_wait_block#,
vs.row_wait_row# row_wait_row#,
dbms_rowid.rowid_create ( 1, vs.ROW_WAIT_OBJ#, vs.ROW_WAIT_FILE#, vs.ROW_WAIT_BLOCK#, vs.ROW_WAIT_ROW# ) rowid_created,
objs.owner object_owner,
objs.object_name object_name,
objs.object_type object_type,
round( locks.ctime/60, 2 ) lock_time_in_minutes,
from gv$session vs,
gv$lock locks,
dba_objects objs,
dba_tables tbls
where locks.id1 = objs.object_id
and vs.sid = locks.sid
and objs.owner = tbls.owner
and objs.object_name = tbls.table_name
and objs.owner != 'SYS'
-- and locks.type in ('TM', 'TX')
order by lock_time_in_minutes;
Edited by: user3564713 on Jun 10, 2012 10:56 PM

Firstly, read this thread
Identifying locked rows
And the last bit from Randolf
>
It is a common misconception that you can locate a locked row in Oracle via a query. The point is that the information that you're querying only gets populated in case of a blocking lock, and even then not in every case, since you might have blocking locks that do not refer to a particular row.
Oracle stores the lock information within the block, so if you identified in which block the row is located that you've attempted to lock, you could get detailed information about the row locks of that block by performing a block dump.
Other than that Oracle doesn't maintain this information anywhere else and it is only externalized for blocking situations - it is a matter of design that there is no central lock manager in Oracle that would inherently limit scalability, hence the downside of that approach is that there is no central information pool where you could obtain detailed information about row level locks.
>
However, if you see support note "Sample Code to Select from a Table EXCLUDING Locked Rows [ID 186531.1]"
You can take the same code from the script in that note to identify rowid of the locked rows.

How to implement the shared lock in a table view

Hi,
How to implement the shared lock in a table view.for multiple users to edit on this same table.
Thanks in advance
Swathi

Hi,
Please refer this link to find solution to your querry.
Hope it helps.
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/c322c690-0201-0010-fb86-811c52b0acc2.
Regards,
Rahul

Lock On the table

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