https://www.pachadata.com/en/tags/troubleshooting/Recent content in Troubleshooting on Rudi BruchezHugoenWed, 21 Oct 2026 19:34:11 +0200https://www.pachadata.com/en/docs/articles/sql-server/performance/query-store-collection/Wed, 21 Oct 2026 00:00:00 +0000https://www.pachadata.com/en/docs/articles/sql-server/performance/query-store-collection/<p><em>Co-written with Claude, who ran the lab tests and part of the research.</em></p> <div class="alert alert-success" role="alert"><div class="h4 alert-heading" role="heading">TL;DR</div> <p>The Query Store keeps the text, the plans and the runtime statistics of the queries it captures, but not who ran them, nor the parameter values beyond compilation. Even in <code>ALL</code> mode, it sees neither <code>TRUNCATE TABLE</code>, nor <code>CREATE TABLE</code>, nor <code>ALTER TABLE</code>, nor <code>DBCC CHECKTABLE</code>, nor ad hoc queries run from <code>master</code> or <code>tempdb</code>. A query that fails or that the client cancels is recorded, a session ended by <code>KILL</code> leaves only its text and its plan, and a hard shutdown of the instance erases the statistics not yet written to disk.</p> </div>