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Jan 13, 2016 · Databases

Uncovering Oracle’s DUAL Table: Hidden Behaviors, FAST DUAL, and Common Pitfalls

This article explores the mysterious Oracle DUAL table, detailing its purpose, how it behaves during different instance startup phases, the performance‑boosting FAST DUAL feature, practical tests that reveal hidden bugs across 10g‑12c, and safe methods for recreating or modifying the table.