Locked table row

I would like to identify the user who has a specific table row locked from another user who initiates a SELECT ... WHERE ROWID = ... FOR UPDATE ON ... NOWAIT. Is it possible to determine who has that lock?

You can first select holding_session, waiting_session from dba_waiters.
Using these find the username , osuser from v$session where sid=holding_session or
sid=waiting_session
<BLOCKQUOTE>quote:<HR>Originally posted by C. Fetter ([email protected]):
I would like to identify the user who has a specific table row locked from another user who initiates a SELECT ... WHERE ROWID = ... FOR UPDATE ON ... NOWAIT. Is it possible to determine who has that lock?<HR></BLOCKQUOTE>
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Similar Messages

How to find who has locked a row in a table?

My DB is a Oracle Database 10g Enterprise Edition Release 10.2.0.4.0.
My question is very simple: You try to update a row of a table but find out it is locked by somebody else.
How do I find which user (or session) has locked that row?

SELECT Decode(request, 0, 'Holder: ',
                       'Waiter: ')
       ||vl.sid sess,
       status,
       id1,
       id2,
       lmode,
       request,
       vl.TYPE
FROM   v$lock vl,
       v$session vs
WHERE ( id1, id2, vl.TYPE ) IN (SELECT id1,
                                        id2,
                                        TYPE
                                 FROM   v$lock
                                 WHERE request > 0)
       AND vl.sid = vs.sid
ORDER BY id1,
          request

Table Row Frequent Lock

Dear All,
Recently we had changed our remote connection from 128KB Leased Line to high speed IP VPN (1MB) MPLS based lines. After that onwards Oracle table rows are getting locked frequently. We are using Windows 2003 Server Std with 9i 2.0.7 database loaded. Server Total Memory is 4GB with 3.2 MHz dual processor.
When we increase the sga_max_size (1400MB or above), ORA-12500:TNS:Listener failed...... error appears and users can't connect to our database server.
Memory Configuration is:-
Shared Pool - 352MB
Buffer Cache - 584MB
Large Pool - 128MB
Java Pool - 16MB
SGA Max Size - 1281.573 MB
Aggregate PGA Target - 259MB
Please help to correctly calculate the Memory configuration if its wrong. Or is there any other solution to sort out the table row locking problem.
Thanking you all in advance,
Manesh

On initial guess, it sounds like you are chasing the wrong aspect of the problem.
You do not describe what the application is doing, but logically it appears that you are getting more transactions happening because of the higher access speed. In other words, the client is no longer being throttled back.
You also do not decribe the actual kind of lock. It intrigues me that specific rows would need to be locked - that implies that the application is attempting to capture the rows ahead of time. This sort-of feels like the application may have been ported from another system, or designed based on a totally different locking machanism that what Oracle usess, forcing Oracle to try to work in a way it is not supposed to work.
Simply throwing more resources at the problem will [probably] not solve the problem - it may alleviate it for a while. Better would be to understand what is actually happening and correct the root cause.
I encourage you to read Tom Kyte's "Expert Oracle Database Architecture: 9i and 10g Programming Techniques and Solutions" to get some tools to help undertsnad and isolate the actual problem. (http://apress.com/book/bookDisplay.html?bID=10008)
As for the ORA-12500, I believe Metalink has a few notes about that.

How can i explicitly lock a row of a Table

Hi
How can we implement optimistic locking , i am using Oracle as Database for my Application .
Assume that i am working on a single row of a Table .
Now please tell me how can i explicitly lock this row , so that other simultanoues users insert or update operations are not affected to this particular row .
I am not using any ORM related technology
Please help .

raviprivate wrote:
Hi
How can we implement optimistic locking , i am using Oracle as Database for my Application .
Assume that i am working on a single row of a Table .
Now please tell me how can i explicitly lock this row , so that other simultanoues users insert or update operations are not affected to this particular row .Either you want optimistic locking which does not use (database) locks at all, or you want pessimistic locking which does use database locks.
In optimistic locking everyone is allowed to read and to update without taking out a lock. Usually the optimistic lock is realised by including either a 'version' or 'last_modified' column which with every update is either increased (version) or set to the current_timestamp (last_modified). The update statement must be issued with a condition including that column (eg UPDATE ... WHERE id=<id> AND version=<version at time of read>). If the column was already changed by another user or process zero rows will have been updated signalling to the program that another user already changed the row and the user must redo his changes, or a more complex method of change comparison can be done.

Table/row locking

Hi Guys,
Is this related to db size table/row locking?
thanks
version: 10.2.0.5
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)
org.exolab.castor.jdo.LockNotGrantedException: persist.writeLockTimeoutcom

dbaing wrote:
Hi Guys,
Is this related to db size table/row locking?
thanks
version: 10.2.0.5
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)
org.exolab.castor.jdo.LockNotGrantedException: persist.writeLockTimeoutcomrow locking is 100% & totally independent of table size or number of rows in the table.
java stack dump is borderline meaningless.
You need Oracle error number & message to determine root cause.

Timeout when inserting row in a locked table

How can I set the timeout before an INSERT statement fails with error ORA-02049 (timeout: distributed transaction waiting for lock) when the entire table has been lock with LOCK TABLE .
Documentation says to modify DISTRIBUTED_LOCK_TIMEOUT parameter, but it is obsolete in Oracle 8i.
Any idea ???

You could set an alarm() in a signal. Then on return (for whatever reason) you clear the alarm, inspect the return code of the sql execute call and determine what happened (i.e. did the transaction completed or did the alarm get you).
Hope it helps.
-Lou
[email protected]
How can I set the timeout before an INSERT statement fails with error ORA-02049 (timeout: distributed transaction waiting for lock) when the entire table has been lock with LOCK TABLE .
Documentation says to modify DISTRIBUTED_LOCK_TIMEOUT parameter, but it is obsolete in Oracle 8i.
Any idea ???

Lock tables when load data

Are there any way to lock tables when i insert data with SQL*Loader? or oracle do it for me automatically??
how can i do this?
Thanks a lot for your help

Are there any problem if in the middle of my load (and commits) an user update o query data ?The only problem that I see is that you may run short of undo space (rollback segment space) if your undo space is limited and the user is running a long SELECT query for example: but this problem would only trigger ORA-1555 for the SELECT query or (less likely since you have several COMMIT) ORA-16XX because load transaction would not find enough undo space.
Data is not visible to other sessions, unless, the session which is loading data, commits it. That's the way Oracle handle the read committed isolation level for transaction.
See http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96524/c21cnsis.htm#2689
Or what happens if when i want to insert data someone has busy the table?You will get blocked if you try to insert data that has the same primary key as a row being inserted by a concurrent transaction.

IDOC Receiver Adapter, getting Lock Table Overflow to CRM System

Hello SDN!!!
This scenario is for PI to process a file and send to CRM via IDOC. The IDOCu2019s are only being created and not processed until later.
Problem: I am getting a Lock Table Overflow error in method IDOC_INBOUND_ASYNCHRONOUS via sm58 in PI which points to the CRM box.
I have been searching many forums and every solution seems to indicate increasing the lock table, the problem with that solution is we are currently trying to create (not process yet) 80000 IDOCu2019s. This would allocate too much for the lock table.
So my question is this, Shouldnu2019t the lock be released when the IDOC gets created or none the less when a packet of IDOCu2019s via content management (breaking up the file in 1000 increments) finish. The lock table in CRM keeps increasing until all rows from the file, sent via IDOC adapter in 80 messages with 1000 IDOCu2019s per messagein the table are complete (80 separate messages in sxmb_moni).
Background:
IDOC was imported, changed to include unbounded and reimported.
Content Management breaks the file into 80 different segments, thus creating 80 distinct mappings with distinct MessageIdu2019s.
80 IDOC packets are sent to CRM, via IDOC adapter and sm58.
TCODE sm12 in CRM shows the table to keep growing and locks not released until full message is complete.
Any help would be appreciated
Cheers
Devlin

The only way to process the IDOCs in this case is by increasing the "enque/table_size" parameter in order to create the required IDOCs. You can increase the value for this parameter up to 102400 (beyond that can cause performance issues). Since you need to handle 80000, this shouldn't be an issue.
Please refer to the notes below for more information about the lock queue overflow and management.
[Note 552289 - FAQ: R/3 Lock management|https://websmp230.sap-ag.de/sap(bD1wdCZjPTAwMQ==)/bc/bsp/spn/sapnotes/index2.htm?numm=552289]
[Note 13907 - System error in the block handler, overflow lock table|https://websmp230.sap-ag.de/sap(bD1wdCZjPTAwMQ==)/bc/bsp/spn/sapnotes/index2.htm?numm=13907]

How to lock a row before update using UPDATE statement ?

I want to lock a row before updating using the UPDATE statement! is there any "reserved word" that I can append to an update statement so, that the row get locked!, also, will the lock gets released automatically once the update is done or do I have to explicitly release the lock?
how can I do this ?
any help is greatly appreciated.
Thanks,
Srini.

For detail information, see http://otn.oracle.com/doc/server.815/a67779/ch4l.htm#10900
The lock will be released by "commit".
FOR UPDATE Examples
The following statement locks rows in the EMP table with clerks located in New York and locks rows in the DEPT table with departments in New York that have clerks:
SELECT empno, sal, comm
FROM emp, dept
WHERE job = 'CLERK'
AND emp.deptno = dept.deptno
AND loc = 'NEW YORK'
FOR UPDATE;
The following statement locks only those rows in the EMP table with clerks located in New York. No rows are locked in the DEPT table:
SELECT empno, sal, comm
FROM emp, dept
WHERE job = 'CLERK'
AND emp.deptno = dept.deptno
AND loc = 'NEW YORK'
FOR UPDATE OF emp.sal;

How to lock a row in a db2/400

Hi all,
Could someone show me how to lock a row in the database DB2/400
The scenario:
DB.beginTransaction
User 1 gets a row with a column bill_number
"select bill_number from numbers where pk = xxx for update"
aux_bill_number = bill_number
USER 1 updated this row
"update numbers set bill_number = bill_number +1 where pk = xxx "
USER 1, like final step, insert aux_bill_number in other table as primary key
DB.commitTransaction
While doing so,
User 2 also gets a row with a bill_number. this user must take bill_number with value 2, but take the same value 1
This it causes key duplicated in the destiny table.
Please, help me.
How I must lock the row not to allow to read until finishing the previous transaction?

Hi all,
Could someone show me how to lock a row in the
database DB2/400Isn't SELECT FOR UPDATE standard?
>
The scenario:
DB.beginTransaction
er 1 gets a row with a column bill_number
"select bill_number from numbers where pk =
xxx for update"
aux_bill_number = bill_number
1 updated this row
"update numbers set bill_number = bill_number
+1 where pk = xxx "
USER 1, like final step, insert aux_bill_number in
other table as primary key
DB.commitTransactionSounds like you're trying to do something that a JOIN would do better.
While doing so,
User 2 also gets a row with a bill_number. this user
must take bill_number with value 2, but take the
same value 1
This it causes key duplicated in the destiny table.
Please, help me.
How I must lock the row not to allow to read until
finishing the previous transaction?Setting the isolation level to SERIALIZABLE might help.
%

How to lock a row by using 'for update'?

how to lock a row by using 'for update'?

Hi,
SELECT * FROM <TABLE> WHERE <PK_COLUMN>=<VALUE> FOR UPDATE NOWAITThis will help in locking the row with the primary key value that you provide
cheers
VT

Lock tables during partition exchange

Hi,
I want to do the following thing:
there are 9 partitioned tables (set A) and 9 non partitioned (set B).
There is a continuous dataflow into set A.And there is also a dependency between the nine flows within each transaction into set A (there is no dependency between different transactions.).
What I want is to exchange the nine partitions of set A with set B. This because I want to have a performance boost instead of copying the data from A into B.
I need to lock the tables of set A to make sure there is NO insertion of data into one of the tables of set A to avoid loss of dependency and thus loss of data.
I tried several things: lock tables, run autonomous transaction in which the exchange takes place, commit and unlock. But no success.
Who can help me to solve my problem: to lock all nine tables of set A and make sure the dependency remains consistent and no data gets lost?
Thanks.
jurgen

Why you are bothering about LOCKing the table,
you can goahead and do the exchange the table,
since, its ongoing activity, exchanged partition will be there till you merge, drop it.
if you found some more rows after exchange, then you can insert same into that table, or make another table.
Thanks

Insert & Update while Locking tables

Update & Insert
Is it possible for me to insert a record and update 2 fields in another record, whil locking the database tables for the process to take place?
If so, how?
Thanks
Pete

I don't know which database server you are using. But in MySQL, you can do something like this:
<?php
function get_next_number( $field = 'id' )
 $id = 0;
 //Lock the table for write
 mysql_query('LOCK TABLES name_of_table WRITE');
 $sql = 'SELECT '.$field.' FROM name_of_table ORDER BY '.$field.' DESC LIMIT 1';
 $query = mysql_query($sql);
 if ( mysql_num_rows($query) > 0 )
 $row = mysql_fetch_row($query);
 //Get the $field value
 $id = $row[0];
 //Unlock tables
 mysql_query('UNLOCK TABLES');
 return ++$id;
?>
I didn't test this function, but the idea is that
Check if you are connected to MySQL server
Regards,
Rafael

Locking tables

I am declaring and using the following cursor:
 CURSOR curCompany IS
 SELECT c.Company_ID, c.No_Employees
 FROM Company c
 WHERE (SELECT COUNT(*) FROM Student s
 WHERE s.Company_ID = c.Company_ID) > 0;I would like to include a FOR UPDATE OF Student.col to it so rows could be locked while they are being updated, but can't.
1) What is the best way of locking the table? I've been reading up on LOCK TABLE and am willing to use it but would like to hear what you guys have to say on this.
2) Is there an operator/function like EXISTS that would replace the sub-query in the WHERE clause?

I will tell you real world scenario:
 
Let suppose I have a table from I am getting series for my transaction depending on some parameter. 
 
Here at the time of pre insert in my form I use as follows:
 
Select series from table_name FOR UPDATE;
 
Offcourse I add in condition also.
 
At the time of post insert I release the lock as follows:
 
Update table_name SET series+1 with condition.
 
Why I am doing this because I want to make sure same number is not used by two transaction.
 
Raj 
www.oraclebrains.com<a>
 POWERED by the people, to the people and for the people WHERE ORACLE IS PASSION.

ADF BC , lock the rows sometimes and do release it

Hi
thank you for reading my psot
i think ADF BC sometimes lock my Rows in table and does not allow other to change them , sometimes the lock goes too long time without any reason
(a record insert lock the rows until i restart the APPS) i should say that during record insert and commit may some exception occurs that prevent the ADFBC to commit the changes.
should it be like that ?
thanks

Are you seeing this problem in the Business Components tester?
Can you reproduce in a simple case?
Is there a specific JBO error appearing?
Regards
Grant Ronald
Oracle Product Management

Locked table row

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