<ul data-eligibleForWebStory="true"><li>Periodic CPU spikes were observed on a SQL Server instance causing stored procedures to time out.</li><li>Despite no suspicious changes or deployments, the issue persisted leading to further investigation.</li><li>Upon examining the execution plan, it was discovered that failing stored procedures accessed the same table (referred to as Transactions).</li><li>An Index Scan on the Transactions table was highlighted as a major factor in the performance problem.</li></ul>

This SQL Query Looked Fine — Until It Silently Broke Everything

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