Test Day 1: SSMS 22.5 Copilot vs. Complex Execution Plans (Spoiler: It saves you hours)

Before we start, catch up on my previous performance tuning deep-dives: SQL Server: SSMS 22.5.0 Changes How You Work 

Test Day 1: SSMS 22.5 Copilot vs. Complex Execution Plans (Spoiler: It saves you hours)

In this post, I’ll show you exactly how the brand-new SSMS 22.5.0 Copilot integration reads execution plans to cut your performance tuning workflow in half. Don’t miss this day-one field test to see if AI can truly optimize your bottlenecks!

✔️ Copilot now interacts directly with the result pane, including execution plans and statistics. 🛠️ ✔️ Identifies hidden bottlenecks like implicit conversions and expensive table scans in seconds. ⏱️ ✔️ Data privacy matters: Ensure your Copilot tier matches your corporate security policies. 🔒 ✔️ Minor bugs fixed: SSMS 22.5.0 stabilizes DTA and Extended Events filter behaviors. ✔️

Hi SQL Server Guys,

We all know how important it is to make every second count when managing SQL Server environments. Yesterday, April 14, 2026, Microsoft dropped the highly anticipated SSMS 22.5.0 update alongside the mid-month Patch Tuesday. While everyone is talking about the new Database DevOps templates, there is one feature that demands our immediate attention: GitHub Copilot can now interact with the result pane.

Let's dive into this game-changing feature and see how it behaves under fire with a real-world tuning scenario!

🧪 The Field Test: What It Really Is

Until now, Copilot in SSMS was mostly a glorified autocomplete. With version 22.5.0, the context management has been drastically improved. It now reads the active editor content and, crucially, the results grid and XML Showplan output.

To test this, I intentionally ran a "disaster query" against a 50-million row table. The query suffered from a classic performance killer: an implicit conversion.

-- 💣 The Disaster Query: Forcing an Implicit Conversion
DECLARE @SearchDate NVARCHAR(50) = '2026-04-14';

SELECT OrderID, CustomerID, TotalAmount
FROM Sales.Orders
WHERE OrderDate = @SearchDate; -- OrderDate is actually a DATETIME data type

I generated the Actual Execution Plan and opened the Copilot Chat. My prompt was simple: "Analyze the active execution plan. Why is this query taking 4 seconds?"

The AI's Response: Copilot immediately flagged the CONVERT_IMPLICIT warning on the Clustered Index Scan. It correctly noted that comparing an NVARCHAR variable to a DATETIME column forces SQL Server to scan the entire index, bypassing any potential seeks. It then generated the corrected script.

-- ✔️ The Copilot Fix
DECLARE @SearchDate DATETIME = '2026-04-14';

SELECT OrderID, CustomerID, TotalAmount
FROM Sales.Orders
WHERE OrderDate = @SearchDate;

🚀 My REAL Strategy

In my experience, Copilot’s new ability to parse execution plans is a massive time-saver for identifying low-hanging fruit like implicit conversions, missing indexes, or skewed cardinality estimates. However, always validate Copilot's suggestions before applying them to production. Use it as an advanced diagnostic tool, but rely on your 25 years of expertise to ensure the proposed index or code change actually fits your database architecture. Furthermore, if you are working on a corporate database, ensure you are using the Business or Enterprise Copilot tiers so your proprietary schema isn't used to train public models.

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Biondi Luca @2026 - Sharing over 25 years of Gained Knowledge for Passion. Share if you like my posts!

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