Blocking multiple SOA Instances when polling from DB Adapter?

Hi,
I am on SOA 11.1.1.3 and have a simple requirement of sequential processing from a database table. I hence created a BPEL process to poll the DB and process the records sequentially by inserting 10 records in a single XML (and doing a while loop on these records). I have also kept a polling interval of 30s with Logical Delete option.
When I have just 10 records in the table, it works fine by creating one instance. However, when there are 20 records in the table, it creates 2 instances of 10 records each and since these two instances are processed in parallel, the sequential processing no more happens and records are processed out of order.
Is it possible to limit the number of instances to just one and prevent the second instance from kicking off. I have read about the singleton process but can I use this on a single node as well?
Any inputs will be appreciated.
Thanks!

Hi
From what I know there is nothing out of box that does guarantee ordered execution of instances. That is due to the Queue based work storage and multiple threads pulling data for execution of instances.
I am not sure if that should be supported out of box as well.
Polling process is expected to poll for records every X interval. And create instances that can be processed with in the container.
From what I understand, the requirement needs to stop the polling process if there is a active instance
OR
Create a instance during each polling and check if there is an existing instance, wait till the other instance is complete and then proceed in order if multiple instances have been polled during the waiting window.
One option that I have implemented that works at the source (database) works like this:
1. Change the Db Adapter to logical delete
2. Create a view on the database to only show 1 NEW record, or no records if there is a RESERVED record
3. You might have to write a trigger on the table for updates to complex view created
At least the requirement that I had was to process records in the order they were created.
Status table look up might be tricky as it can not guarantee ordered execution of records as threads might grab the status in random order. But if the requirement is 1 at a time rather than ordered, this would be fine.
But from JVM load perspective, instances might be sitting in the memory doing constantly trying to grab status from table. From performance perspective other options would need to be explored.
Regards
Kalidass Mookkaiah

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