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Please note first of all that EDQ comes with pre-configured matching services for exactly this purpose so you do not normally need to configure all the rules yourself, though of course you can if needed.
The standard architecture is not to attempt to synchronize the data between the application and DQ, but to pass the data between - so avoiding the many issues with data replication and synchronization.
In this architecture, EDQ provides Key Generation as a service. The service is first run in batch on all records in the system. Key values then need to be stored in a skinny table (ID, Key) in the application. Many key values are created per record.
Then in business as usual processing, a new or updated record is passed to EDQ and its keys generated using the service. The keys are then used to select candidates (records which might match the driving record) using the skinny table, and some logic to select the DQ data (name, addresses, emails, phone numbers, SSN etc.) from the app. database. Then both the driving record and the candidates are passed to the matching service, which passes back the records which are a good match along with a score and a rule name indicating why they matched.
All of the above is provided and described in the EDQ Customer Data Services Pack. See http://www.oracle.com/technetwork/middleware/oedq/documentation/index.html for more information.