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PostgreSQL vs Oracle: When Higher Cost Means Better Performance

This story is from 2026-09-05. It is preserved in the archive; the latest stories are on the live feed.

Database optimizers don’t see the future. They make decisions based on statistics, estimates, and cost models — and most of the time, those decisions work remarkably well. But what if the optimizer says: “The Sequential Scan is cheaper.” …and reality says: “The Index Only Scan is almost twice as fa…

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  1. 2026-09-05 06:32 · DEV Community — AI
    PostgreSQL vs Oracle: When Higher Cost Means Better Performance

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