Comparing two data sets in BPEL

Hey guys,
There exists a web service that provides (and is the source of) data and a table that is independent of the service that holds the same data. I'm writing a BPEL 11g process to sync the data that is returned from the service with the data in the table. I invoke the service and database adapter to receive a collection of the data and I need to compare the two data sets to see what's in the service's data set that isn't in the table's data set, so that I can insert them into the table. I also need to compare the values of the data sets for possible updates to already existent records. I'm not sure how to do this though. I was thinking of using an embedded java activity to compare the two sets. What's the best way to do this? Code examples would be much appreciated.
Thanks,
Bill

Hi Bill,
How many records are we talking about here? BPEL may not be the best option for synchronisation of large data sets... Probably ODI would be more suitable...
S.Ananth's solution is probably the simple and neat way to solve your case... would this operation BLINDLY update all records? Short answer: no
Long answer... Merge first reads the corresponding records in the database, calculates any changes, and then performs a minimal update. INSERT, UPDATE, and MERGE make the most sense when you are thinking about a single row and a single table. However, your XML can contain complex types and map to multiple rows on multiple tables. Imagine a DEPT with many EMPS, each with an ADDRESS. In this case, you must calculate which of possibly many rows have changed and which to insert, update, or delete. If a specific row did not change or only one field changed, then the DML calls is minimal.
About merge on DBAdapter...
http://docs.oracle.com/cd/E28280_01/integration.1111/e10231/adptr_db.htm#BDCDBAJI
Cheers,
Vlad

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