“It’s quite possible the outage would not have occurred if Amazon had stuck with Oracle,” said Matt Caesar, a computer science professor at the University of Illinois at Urbana-Champaign, after CNBC shared the details of the document. “Also, it appears they would have been able to diagnose the problem sooner if they were using Oracle’s database, which could possibly have reduced the outage duration.”

An Amazon spokesperson played down the issue in an emailed statement and said there was no outage, even though the internal document states that the database “degradation resulted in lags and complete outages.”

“It is important to point out that there was never an outage at the facility, and the issue only resulted in delaying shipping of about one percent of packages for a short period of time,” the spokesperson said. “This issue was quickly diagnosed and resolved.”

The Ohio warehouse is the largest of the 13 warehouses that moved its database off Oracle prior to Prime Day. During the Prime Day period, it handled over 1.1 million packages per day, the documents say. All services and software that handle inventory and shipping data had been migrated to Aurora in those warehouses.

The outage, which lasted for hours on Prime Day, resulted in over 15,000 delayed packages and roughly $90,000 in wasted labor costs, according to the report. Those costs don’t include all the lost hours spent by engineers troubleshooting and fixing the errors or any potential lost sales.

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