| In this chapter, we learned the following: The latency due to nightly batch processing can be very costly to a business, both in capital expense and customer service terms. Batch processing does not really fit the needs of a company that needs to run 24/7 in a global economy. Refactoring to an ESB can provide a migration toward real-time data exchange, which removes the latency and reliability problems associated with ETL. An ESB can be adopted incrementally, in a nonintrusive fashion by using special file-drop services that mimic the interfaces of the previous batch processing solutions.
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