Summary: The latest cumulative update for SQL Server 2025 improves Query Store behavior in Always On Availability Groups, reducing overhead on readable secondaries.
Why It Matters for Developers
For teams running Always On AGs, enabling Query Store on secondaries often caused performance regressions. This update reduces that overhead, making it safer to capture query plans across all replicas.
My Take
Query Store is one of the most underused features in production SQL Server environments. If you haven't enabled it yet, this update is a good reason to reconsider.