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Scalability Rules: Principles for Scaling Web Sites, Second Edition by Michael T. Fisher, Martin L. Abbott

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8. Database Rules

As we discussed in Chapter 7, “Learn from Your Mistakes,” we believe that an incident is a terrible thing to waste. In a sense, at the conclusion of any incident, we’ve paid some price. This price may be lost revenue associated with lost transactions, or in subscription model products it may be in an impact on customer satisfaction and perhaps future customer churn. As such, we need to reap the maximum value of that incident and learn everything we possibly can from it. The PayPal 24.0 incident described in Chapter 7 is an example of an incident with many hidden lessons.

Recall from our discussion in that chapter that the PayPal approach (circa 2004) of immediate synchronous debits and credits was inconsistent with industry ...

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