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Data & Analytics · Advanced

Plan Regression

A performance drop caused by the optimizer switching a query to a worse execution plan.

Definition

Plan regressions follow statistics updates, parameter sniffing, upgrades or schema changes. Query Store detects them, and Automatic Tuning's FORCE_LAST_GOOD_PLAN can correct them automatically.

Exam tip

Automatic plan correction (FORCE_LAST_GOOD_PLAN) addresses plan regressions in Azure SQL.

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