Oracle DB Polling Proxy not polling for records concurrently

Problem Description
We have created a Polling Proxy on OSB from a DB Adapter with the below JCA parameters
• PollingStrategy = "LogicalDeletePollingStrategy"
• MarkReadColumn = "STATUS"
• MarkReadValue = "S"
• MarkReservedValue = "R${weblogic.Name-2}-${IP-2}-${instance}"
• MarkUnreadValue = "R"
• PollingInterval = "60"
• MaxRaiseSize = "1"
• MaxTransactionSize = "10"
• NumberOfThreads = "1"
• ReturnSingleResultSet = "false"
The Proxy picks the records when the state change to "R" and updated the state value to "S". When the proxy fails for any reason the State of the record is changed to a Reserved State. When any record is in a reserved State the proxy does not pick other records that are in a State "R" until the row with the Reserved State is removed.
This leaves all the other records un-processed......
Are the JCA configurations correct in our case?
Regards,
Vinay V Krishnan

This may help...
http://javaoraclesoa.blogspot.com.au/search/label/markreservedvalue
Cheers,
Vlad

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      <property name="QueryName" value="dbPollBlockRecordsSelect"/>
      <property name="MappingsMetaDataURL" value="dbPollBlockRecords-or-mappings.xml"/>
      <property name="PollingStrategy" value="LogicalDeletePollingStrategy"/>
      <property name="MarkReadColumn" value="STATUS"/>
      <property name="MarkReadValue" value="PROCESSED"/>
      <property name="PollingInterval" value="700"/>
      <property name="MaxRaiseSize" value="1"/>
      <property name="MaxTransactionSize" value="10"/>
      <property name="NumberOfThreads" value="1"/>
      <property name="ReturnSingleResultSet" value="true"/>   (This property has been manually configured, will unfortunately poll all records that match without it)
Regards

DB Adapter: Polling For New Records returns the First record multiple Times

I Polling for New or Chnaged Records against DB2 on iSeries. The DB Adapter returns the first record from the Table multiple Times. If the Table has 5 records it displays the first record 5 times. I am using BPEL 10.1.3.1 Can anyone help me with this.

Hi there,
please check out the DBAdapter trouble-shooting guide:
http://download-east.oracle.com/docs/cd/B31017_01/integrate.1013/b28994/app_trblshoot.htm#CIHFEHFA
I am copying an entry from there into here:
A.1.21 Some Queried Rows Appear Twice or Not at All in the Query Result
Problem
When you execute a query, you may get the correct number of rows, but some rows appear multiple times and others do not appear at all.
This behavior is typically because the primary key is configured incorrectly. If the database adapter reads two different rows that it thinks are the same (for example, the same primary key), then it writes both rows into the same instance and the first row's values are overwritten by the second row's values.
Solution
Open Application Sources > TopLink > TopLink Mappings. In the Structure window, double-click PHONES. On the first page, you should see Primary Keys. Make sure that the correct columns are selected to make a unique constraint.
Save and then edit the database partner link.
Click Next to the end, and then click Finish and Close.
Open your toplink_mappings.xml file. For the PHONES descriptor, you should see something like this:
<primary-key-fields>
<field>PHONES.ID1</field>
<field>PHONES.ID2</field>
</primary-key-fields>
Thanks
Steve

Sender SFTP Adapter channel is not polling for files

Hello All,
Couple of SFTP sender adapter channel was failing in Developent system with u201Cdirectory listingu201D error.All SFTP sender channels stopped polling for the files in Developent system . We were unable to find the reason for adapter failure, Hence we restarted the j2ee server and adapter started polling files. Later we are facing the same issue in Quality system. THe adapter cahnnel is not polling files in Quality system even.
All lean tool adapters were showing the u201CHost key was not accepted erroru201D on 27th of Feb . As per the other channel trace, the time stamp of last successful polling and error time stamp of lean tool sender channels are exactly same
Eventhough two communication channels access the same SFTP adapter, one communicationchannel is getting 'Host key was not accepted error' but in other communication channel, files are getting picked.
Please let me know the solution if you have come accross this issue previously
Regards,
DilipKumar

Hi Mike,
Thanks for your reply.
Its not a standard SFTP adapter rather its a C-BURGER SFTP adapter.
Sorry I did not mention this in my previous post
Regards,
DilipKumar

Polling New Records in a table/Multiple servers

We have a production environment that consists of 2 servers and I have a BPEL process that polls new records in a table and then sets flag as completed.
Will this be a problem since we have more than one server?
I ask this because I have another BPEL process that polls a FTP directory for files and then moves them after processing but when the process is put on the 2 servers, the process always becomes inactive and stops polling the directory, then I make it active again and it works for a little while and then becomes inactive again. I solved this be putting this process on my local SOA installation but I want to find a resolution for this.
Thanks
james

The issue you have with the FTP adapter is that you have not configured it as a singleton adapter. Once this is done you will not have this issue.
The DB adapter will not get the error that you get with FTP but you may get strange behavior if not configured correctly. If you are not using a sequencing file you should be ok as the dabase takes care of any locking. If you are using the sequencing function, e.g. sequence table then you may get 2 messages fired as both servers kick get the poll.
To configure the db adapter for polling have a look at the following doc.
http://download.oracle.com/docs/cd/E10291_01/core.1013/e10294/webapp.htm#CHDIDCGH
cheers
James

Polling for database updates fails to update sequence file/table

I have a small system to poll for changes to a database table of student details. It consists of:
Database adapter, which polls the database for changes, retreives a changed row, and passes the generated XML to -
"receive" router service, which simply passes the retrieved database XML data to -
"execute" router service, which transforms the XML and passes the new message to -
File Adapter, which writes the transformed XML to a file.
The problem is that the database polling is not updating the sequence recorder - I have tried using a sequence file which stores the personnumber, a sequence table which stores the personnumber and a sequence table which stores the last-updated timestamp. In all cases the database adapter successfully reads the sequence file/table and retreives the correct row, based on the sequence value ( I have tested this by manually changing the sequence value), the data is transformed and a correct xml file is created, but the system then fails to update the sequence file/table so that when the next polling time comes around the very same database row is extracted again and again and again.
In the ESB control panel I have one error: "Response payload for operation "receive" is invalid!"
The Trace is:
oracle.tip.esb.server.common.exceptions.BusinessEventRejectionException: Response payload for operation "receive" is invalid! at oracle.tip.esb.server.service.EsbRouterSubscription.processEventResponse(Unknown Source) at oracle.tip.esb.server.service.EsbRouterSubscription.onBusinessEvent(Unknown Source) at oracle.tip.esb.server.dispatch.EventDispatcher.executeSubscription(Unknown Source) at oracle.tip.esb.server.dispatch.InitialEventDispatcher.processSubscription(Unknown Source) at oracle.tip.esb.server.dispatch.InitialEventDispatcher.processSubscriptions(Unknown Source) at oracle.tip.esb.server.dispatch.EventDispatcher.dispatchRoutingService(Unknown Source) at oracle.tip.esb.server.dispatch.InitialEventDispatcher.dispatch(Unknown Source) at oracle.tip.esb.server.dispatch.BusinessEvent.raise(Unknown Source) at oracle.tip.esb.utils.EventUtils.raiseBusinessEvent(Unknown Source) at oracle.tip.esb.server.service.impl.inadapter.ESBListenerImpl.processMessage(Unknown Source) at oracle.tip.esb.server.service.impl.inadapter.ESBListenerImpl.onMessage(Unknown Source) at oracle.tip.adapter.fw.jca.messageinflow.MessageEndpointImpl.onMessage(MessageEndpointImpl.java:281) at oracle.tip.adapter.db.InboundWork.onMessageImpl(InboundWork.java:1381) at oracle.tip.adapter.db.InboundWork.onMessage(InboundWork.java:1291) at oracle.tip.adapter.db.InboundWork.transactionalUnit(InboundWork.java:1262) at oracle.tip.adapter.db.InboundWork.runOnce(InboundWork.java:501) at oracle.tip.adapter.db.InboundWork.run(InboundWork.java:401) at oracle.tip.adapter.db.inbound.InboundWorkWrapper.run(InboundWorkWrapper.java:43) 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 payload is:
<PersonCollection xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.oracle.com/pcbpel/adapter/db/top/ISSSimIN">
<Person>
<name>Bob</name>
<surname>Stupid</surname>
<istatus>2</istatus>
<active>Active</active>
<personnumber>3001</personnumber>
<role>Staff</role>
<organization>TEX</organization>
<updateTimestamp>2007-11-29T14:06:55.000+00:00</updateTimestamp>
</Person>
</PersonCollection>
The payload above is the XML output from the Database adapter, the xsd for which was autogenerated by JDeveloper, so I don't understand how it can be invalid.
I have only been working with ESB for 3 days, but half of that time has now been spent stuck on this issue. Anyone got any ideas??
Richard

You need to be careful. Submit and committing to the database are two different things.
Submit on a page (and autoSubmit the property) are only posting the changes you typed into the field, back down to the application server. NOTHING is happening with the database at this point. So the applications's internal "cache" of records (using something like ADF BC) is holding the changes but the database doesn't know anything. So if you quit now, no changes will go to the database.
These changes onlyget submitted down to the app server when you do some sort of action like press a button. Simply navigating fields will be doing nothing back to the app server. If you add autoSubmit then you will automatically submit the changes on that field down to the app server when you leave the field (but again, this is not touching the database)
You have to explicitly add a COMMIT operation to save those changes to the database.
Maybe if you try in a simple EMP example and send us your findings we can help direct you further.
Regards
Grant

Polling for change in status in db

Hello,
In my current process I need to wait for the change in status (or a new record) in a database.
A while loop, is making the process too large and is not probably the way to go.
Can I achieve this using the db adapter, it has a poll for change but it does not have any parameters.
The query generated is [SELECT ID, DEC_NO, PICK FROM POLL_TEST ORDER BY DEC_NO ASC]
but what I need is [SELECT ID, DEC_NO, PICK FROM POLL_TEST where DEC_NO=#parameter from input]
My flow is like this:-
Step 1 - receive
Step 2 - some other operations
Step 3 - wait //my problem is here
Step 4 - continue with process
Any other way this can be achieved?
Using Oracle SOA suite 10.1.3.1
Thanks.
Edited by: sashwat on Jan 6, 2009 9:32 AM

Hey,
Here is a short sample :
CREATE OR REPLACE PACKAGE "TRAINING"."PCK_PARAM" as
procedure p_set_param( p_val varchar2 );
function f_get_param return varchar2;
end;/
CREATE OR REPLACE PACKAGE BODY "TRAINING"."PCK_PARAM" AS
param VARCHAR2(100);
procedure p_set_param( p_val varchar2 ) AS
BEGIN
param := p_val;
END p_set_param;
function f_get_param return varchar2 AS
BEGIN
RETURN param;
END f_get_param;
END PCK_PARAM;/
create view vw_test as select ename from emp where ename = pck_param.f_get_param;/
select * from vw_test => Returns nothing as the param is null/
select * from emp/
begin
pck_param.p_set_param('KING');
end;/
select * from vw_test => Returns the row for ename = 'KING'/
begin
pck_param.p_set_param('XXXX');
end;/
You can in that way have a parametrised view so you can poll for change on it.
Cheers,
Arnaud

Polling for new Data in Tables with SQL-functions

Hi
In my table I have 2 columns:
event_state : integer (0 = unread, 1 = read)
min_process_time : date
In the DB-Adapter-Wizard I can configure my event_state-Field for using as logical delete field. In the SQL-Query there is a
... WHERE event_state=0
But, I only want to query all new entries in this table, where
min_process_time > SYSDATE.
How can I configure my toplink-mapping, that SYSDATE can be used in the polling-query? If I use plain-sql instead of the expression from the Wizard (last page), then this sql-statement is ignored. In an expression I only can use a constant-value.
Any idea?
Thanks
Gregor

Hi
I am creating a database Polling (logical delete OPEN to CLOSED) adapter that polls a table for records which have a "SCHEDULED" date field.
The Polling Adapter should pick up those records where the status is OPEN and SCHEDULED<=SYSDATE.
DB Adapter wizard does not allows this where clause(SCHEDULED<=SYSDATE) to be set; so i tried modifying the Toplink SQL with custom SQL. But it does not works. Please suggest a workaround.
Please help.
Thanks
Debashis

Oracle DB Polling Proxy not polling for records concurrently

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