How to release an exclusive lock

Hi,
I don't know, how to release a lock, after locking exclusive.
We're locking our BOPF Object like this:
o_task_srv_mngr->retrieve(
        exporting
          iv_fill_data            = abap_false
          iv_node_key             = /cenitapm/if_bo_pw_task_c=>sc_node-pwtsk " Node
          it_key                  =   t_key " Key Table
          iv_edit_mode            = /bobf/if_conf_c=>sc_edit_exclusive
        importing
          eo_message              = o_message
Now how do I release the lock again?
I know, It is released after a save of the transaction manager, but how do i achieve an unlocking without that save?
Regards David

After some investigation, I came to following result:
Locks are released on commit or rollback.
So if I want to release an exclusive lock, I have to rollback everything in the current session.
After feeling limited by this design in the first place, I now think, this is a great way to secure my data integrity.
I only want to release an exclusive lock if I don't want to save my data, or if I want to save it ;)
I just have to ensure, all data not belonging to the actual transaction is saved before setting an exclusive lock to another object.
So thumbs up for the designer of this concept.

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Dear
can you please let me konw how to release a transaction lock on a table.
thanks
VIJAY

I thought of a more traditional method
http://www.stephstuff.com/esafe/images/ouch2.gif
Laurent, You've read my mind :) or vice-versa

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Dear experts,
We are using the following statement to obtain a row lock in a table in the database(ORACLE of course),
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here is the update statement to preserve the lock,
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Edited by: SuoNayi on 2013-5-30 上午8:12

Hm. Is this part of an XA transaction by any chance? I know that Oracle maintains separate bookkeeping for such transactions which can cause rows to stay 'locked' even when the regular DBA views will indicate there is no user currently locking the record at all. I have no idea about the actual details and what you need to do to clean up such a situation, that is something a DBA should know and do.
If not... well this is more of a question for people who know the DBMS, which makes it a target for the Oracle DBMS forums. Java developers don't tend to have DBA-level knowledge of the database, you should ask the question where you have more chance of people with expertise answering stuff:
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A miliion thanks....

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How to Remove svn:needs-lock property in subversion

Hi All:
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UofW

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I have a procedure which loads a table which is used for reporting.
Currently it is a single process which picks up most of the data after joining 2-3 big tables(around 70-80GB) and then loading the main table.
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This process is taking around 40-45 minutes.
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I planned to use GTT table so that i dont have to create 75 temp tables for each sessions.
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So i tested by using 75 temp tables. There i saw that the performance has increased by lots as assumed initially.
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First you should question why you think you need 75 GTT.
Also your question contains no useful information
(no four digit version of Oracle, no OS, no number of processors) , this paragrah
Currently it is a single process which picks up most of the data after joining 2-3 big tables(around 70-80GB) and then loading the main table.
The joins are on PI and also partitions are also being used. Then a lot of updates are done on the main table to update other columns which are being picked from different tables.
As the processing is happening on huge amount of data(around 1M), so processing is taking a lot of time.
This process is taking around 40-45 minutes.tells nothing,
so basically your questions boils down to
- Hey I come from a sqlserver background (this is just an educated guess), how can I find a workaround to wreck Oracle to make it work like sqlserver.
75 parallel sessions on say 4 to 8 processors is a very bad idea, as these sessions will be simple competing for resources.
Also a row exclusive lock is just that: a row level lock. This isn't a problem, usually.
Sybrand Bakker
Senior Oracle DBA

UnitOfWork doesn't release pessimistic row lock???

I have an application that polls a DB table for new "submissions", then forwards them to another server to handle them asynchronously. When the asynchronous response comes back, my application verifies that all response have been received from the server, then sends a combined response. My problem is that the asynchronous response listener threads appear to deadlock when pessimistically locking the submission row, even though the transaction that locked it has been closed for ~1s.
Some psuedocode may help explain the problem. This is my DB polling thread
while( true ) {
Submission s = getNextSubmissionAndLockPessimistically();
if( s == null )
return null;
Server s2 = getServerCapableOfRunning( s );
if( s2 != null )
return s2;
uow.revertAndResume();
I am worried that in the instance that a server capable of running the submission could not be found, or is too full, the UnitOfWork#revertAndResume method does not release the row lock for the submission. Are there any scenarios where this can occur?
On another note, I occasionally receive "Query sent to unactivated UnitOfWork" exceptions during the uow.revertAndResume() call. My code only uses the first UnitOfWork returned by EntityManager#getUnitOfWork(). Could the two be related? Does anyone have any ideas on how to fix this exception?
Thanks,
Dan

Thank you for the detailed description of how the locks are released; I mistakenly assumed the revertObject/revertAndResume would release them. I will refactor my code to create EntityManager/UnitOfWork instances in loop and release/close them instead of reverting.
As for the "unactivated UnitOfWork" exception, here is one of my stack traces:
Exception [TOPLINK-6027] (Oracle TopLink Essentials - 2.0 (Build b41-beta2 (03/30/2007))): oracle.toplink.essentials.exceptions.QueryException
Exception Description: Query sent to a unactivated UnitOfWork.
Query: ReadAllQuery(my.package.ServerLimits)
at oracle.toplink.essentials.exceptions.QueryException.querySentToInactiveUnitOfWork(QueryException.java:893)
at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2217)
at oracle.toplink.essentials.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:937)
at oracle.toplink.essentials.internal.indirection.QueryBasedValueHolder.instantiate(QueryBasedValueHolder.java:86)
at oracle.toplink.essentials.internal.indirection.QueryBasedValueHolder.instantiate(QueryBasedValueHolder.java:76)
at oracle.toplink.essentials.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:90)
at oracle.toplink.essentials.indirection.IndirectList.buildDelegate(IndirectList.java:193)
at oracle.toplink.essentials.indirection.IndirectList.getDelegate(IndirectList.java:315)
at oracle.toplink.essentials.indirection.IndirectList.size(IndirectList.java:640)
at oracle.toplink.essentials.internal.queryframework.CollectionContainerPolicy.sizeFor(CollectionContainerPolicy.java:184)
at oracle.toplink.essentials.internal.indirection.TransparentIndirectionPolicy.getRealAttributeValueFromObject(TransparentIndirectionPolicy.java:252)
at oracle.toplink.essentials.mappings.ForeignReferenceMapping.getRealAttributeValueFromObject(ForeignReferenceMapping.java:370)
at oracle.toplink.essentials.mappings.CollectionMapping.getRealAttributeValueFromObject(CollectionMapping.java:559)
at oracle.toplink.essentials.mappings.CollectionMapping.getRealCollectionAttributeValueFromObject(CollectionMapping.java:574)
at oracle.toplink.essentials.mappings.CollectionMapping.mergeIntoObject(CollectionMapping.java:734)
at oracle.toplink.essentials.internal.descriptors.ObjectBuilder.mergeIntoObject(ObjectBuilder.java:2114)
at oracle.toplink.essentials.internal.descriptors.ObjectBuilder.mergeIntoObject(ObjectBuilder.java:2096)
at oracle.toplink.essentials.internal.sessions.MergeManager.mergeChangesOfOriginalIntoWorkingCopy(MergeManager.java:450)
at oracle.toplink.essentials.internal.sessions.MergeManager.mergeChanges(MergeManager.java:251)
at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.revertAndResume(UnitOfWorkImpl.java:3527)
at my.package.DbInterface.getNextSubmissionAndServer(DbInterface.java:460)
at my.package.PollingThread.waitForNextSubmission(PollingThread.java:175)
at my.package.PollingThread.run(PollingThread.java:122)
This particular error could be related to the DB lock obtained on the Server object, which has a One-To-Many relationship to the ServerLimits.
However, there is another exception that I am worried about:
Exception [TOPLINK-6027] (Oracle TopLink Essentials - 2.0 (Build b41-beta2 (03/30/2007))): oracle.toplink.essentials.exceptions.QueryException
Exception Description: Query sent to a unactivated UnitOfWork.
Query: ReadAllQuery(my.package.Submission)
at oracle.toplink.essentials.exceptions.QueryException.querySentToInactiveUnitOfWork(QueryException.java:893)
at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2217)
at oracle.toplink.essentials.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:937)
at oracle.toplink.essentials.internal.indirection.QueryBasedValueHolder.instantiate(QueryBasedValueHolder.java:86)
at oracle.toplink.essentials.internal.indirection.QueryBasedValueHolder.instantiate(QueryBasedValueHolder.java:76)
at oracle.toplink.essentials.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:90)
at oracle.toplink.essentials.internal.indirection.UnitOfWorkValueHolder.instantiateImpl(UnitOfWorkValueHolder.java:160)
at oracle.toplink.essentials.internal.indirection.UnitOfWorkValueHolder.instantiate(UnitOfWorkValueHolder.java:232)
at oracle.toplink.essentials.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:90)
at oracle.toplink.essentials.indirection.IndirectList.buildDelegate(IndirectList.java:193)
at oracle.toplink.essentials.indirection.IndirectList.getDelegate(IndirectList.java:315)
at oracle.toplink.essentials.indirection.IndirectList.add(IndirectList.java:140)
at my.package.db.Transaction.addSubmission(Transaction.java:422)
at my.package.DbInterface.createNewSubmission(DbInterface.java:284)
at my.package.EngineInterface.executeObjectFn(EngineInterface.java:446)
at my.package.EngineInterface.executeBooleanFn(EngineInterface.java:412)
at my.package.EngineInterface.search(EngineInterface.java:252)
at my.package.mdb.RequestListenerBean.onMessage(RequestListenerBean.java:457)
at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.evermind.server.ejb.interceptor.joinpoint.EJBJoinPointImpl.invoke(EJBJoinPointImpl.java:35)
at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:119)
at com.evermind.server.ejb.interceptor.system.DMSInterceptor.invoke(DMSInterceptor.java:52)
at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:119)
at com.evermind.server.ejb.interceptor.system.SetContextActionInterceptor.invoke(SetContextActionInterceptor.java:44)
at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:119)
at com.evermind.server.ejb.InvocationContextPool.invoke(InvocationContextPool.java:55)
at oracle.j2ee.connector.messageinflow.MessageEndpointImpl.OC4J_invokeMethod(MessageEndpointImpl.java:297)
at RequestListenerBean_EndPointProxy_44242m8.onMessage(Unknown Source)
at oracle.j2ee.ra.jms.generic.WorkConsumer.run(WorkConsumer.java:268)
at oracle.j2ee.connector.work.WorkWrapper.runTargetWork(WorkWrapper.java:242)
at oracle.j2ee.connector.work.WorkWrapper.doWork(WorkWrapper.java:215)
at oracle.j2ee.connector.work.WorkWrapper.run(WorkWrapper.java:190)
at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:819)
at java.lang.Thread.run(Thread.java:595)
The code that caused this error is about as simple as it can get:
EntityManager em = (EntityManager) emf.createEntityManager();
UnitOfWork uow = em.getUnitOfWork();
try
// locate owning transaction and the RECEIVED_FROM_ESB type
Transaction tx = locate( Transaction.class, em, uow, txId );
ServerFunction fn = locate( ServerFunction.class, em, uow, fnId );
TrackingType trackingType = locate( TrackingType.class, em, uow, TrackingType.RECEIVED_FROM_ESB );
// create submission
Submission submission = new Submission();
submission.setPriority( priority );
submission.setRequestId( requestId );
submission.setNistId( nistId );
submission.setFunction( fn );
// create RECEIVED_FROM_ESB tracking status
TrackingStatus status = new TrackingStatus();
status.setTrackingType( trackingType );
status.setStatusTime( new Timestamp( System.currentTimeMillis() ) );
submission.addTrackingStatus( status );
tx.addSubmission( submission );
em.persist( submission );
uow.commit();
em.close();
return submission.getId();
finally
if( uow.isActive() )
uow.release();
if( em.isOpen() )
em.close();
There is a One-To-Many mapping from Transaction to Submission, and a One-To-Many mapping from Submission to TrackingStatus.
If anyone can offer any insight into what I'm doing wrong, I'd appreciate it!
Thanks,
Dan

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