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The third and most important reason:

They have someone to blame when shit goes tits up. Response time may still be abysmal, but "dammit we payed a million dollars for this!"

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and one more thing with large volume transaction processing is scaling out on I/O and ETL jobs.Oracle (and other DB vendors) offer a lot of utilities that scale out perfectly with least of development time. For e.g. it would rather be a difficult deal to work with parsers to parse a Gigabit-data file with code we have to own up , than to use features these DBs directly offer to parallel-load into a ready to use table within minutes.

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