SOA database poller

Question

Hi All,
I am using a DB poller to read records from the table.
The problem is the DB poller picks the records randomly but I want it to process records by creation_date.
Here is my configuration.
<endpoint-activation portType="XX_ptt" operation="receive">
    <activation-spec className="oracle.tip.adapter.db.DBActivationSpec">
      <property name="DescriptorName" value="TestPoller.Test"/>
      <property name="QueryName" value="TestPollerSelect"/>
      <property name="MappingsMetaDataURL" value="TestPoller-or-mappings.xml"/>
      <property name="PollingStrategy" value="LogicalDeletePollingStrategy"/>
      <property name="PollingInterval" value="5"/>
      <property name="MaxRaiseSize" value="1"/>
      <property name="MaxTransactionSize" value="10"/>
      <property name="SequencingColumn" value="CREATION_DATE"/>
      <property name="NumberOfThreads" value="3"/>
      <property name="ReturnSingleResultSet" value="false"/>
      <property name="MarkReadColumn" value="RECORD_STATUS"/>
      <property name="MarkReservedValue" value="R${weblogic.Name-2}-${IP-2}"/>
      <property name="MarkReadValue" value="PROCESSED"/>
      <property name="MarkUnreadValue" value="NEW"/>
    </activation-spec>
Thanks,
Prasanna

Answer 1

Ok,
When you say it is random did you mean that sometimes, you adapter process rows not in the right sequence ?
If yes, you should see this part of the official documentation :
When polling the database for events, you can order the returned rows by the selected column by using the Order By list. The best practice is to choose <No Ordering>, as message ordering regardless is not guaranteed without extra configuration.
I suspect that you have to setup your adapter differently in order to keep the right sequence. I have not the time to check if the answer is in the documentation but I guess that having 3 threads is at least one of the reason.
regards,
mathieu