After a version upgrade your critical query regressed. Outline a triage plan to isolate and remediate the issue.

Problem Statement

Explanation

Capture before-and-after execution plans and compare join order, operator choices, and estimates. Check if new cardinality models or changed defaults altered heuristics. Verify statistics and compatibility settings; sometimes a minor setting flips behavior. As a quick mitigation, use plan freezing or hints while you fix root causes. Then make predicates SARGable, add missing indexes, and consider breaking the query into optimized stages. Document the change and add a regression test so future upgrades keep the better plan.

Code Solution

SolutionRead Only

-- SQL Server
EXEC sp_create_plan_guide_from_handle @name='freeze_q', @plan_handle=...;

Practice Sets

This question appears in the following practice sets:

Query Plans & Performance Tuning

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After a version upgrade your critical query regressed. Outline a triage plan to isolate and remediate the issue.

Problem Statement

Explanation

Code Solution

Practice Sets

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Master Interviews Anywhere, Anytime

After a version upgrade your critical query regressed. Outline a triage plan to isolate and remediate the issue.

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which SQL statement retrieves all columns and rows from a table named employees?

Which clause filters rows before aggregation and affects which rows are grouped?

What is the default sort order when ORDER BY is used without ASC or DESC?

Which construct is commonly used to paginate results in SQL engines like Postgres and MySQL?

Which predicate correctly checks for missing values in standard SQL?

More from SQL & Databases

Master Interviews
Anywhere, Anytime