"ACID Costs Nothing"
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
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The ACID guarantees are purchased, not free — full isolation in particular requires significant additional processing time, and treating the properties as costless hides a real engineering trade.
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A rail reservation system pays in speed for every simultaneous booking it keeps honest.
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Reliability has a bill; someone chose to pay it.