Guaranteeing sequence order when polling with DB adapter

We need to read rows from a source table using the DB adapter in polling mode, and deliver them to separate files in the same order they were read from the DB.
My understanding is that when polling, if we find 10 records to be processed, 10 separate BPEL processes will be created.
It's not clear how to then maintain the sequence order when creating the files, as each process may execute faster or slower than others.
Any advice appreciated
Toby

Marc/Sjoerd,
Firstly, thanks for your replies.
On Marc's suggestion, if say we read 100 records using the database adapter, we get 100 processes. How do we control which process will be the first one to be processed, and which of the remaining 99 processes will be subsequently processed once the first has been completed by the cruncher process?
Sjoerd's 1st and 2nd option are not acceptable to us - we have to ensure the same order the records are read. for example record 1 could be a creation and record 2 could be an update to the first so delivering the update to the destination system before the creation will result in an error.
I'm not clear about option 3 - this sounds similar to Marc's suggestion. I can't see how order is maintained between a group of processes created as a result of the database adapter polling, and them being serviced by a cruncher/singleton process. What is to stop the bp which contains the first record being processed first, then the bp which contains the fifth record being processed second, then the bp which contains the second record being processed third etc?
Thanks
Toby

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