https://flakm.com/tags/sqlx/Recent content in Sqlx on FlakM blogHugoenCopyright © 2023, Maciej Flak; all rights reserved.Mon, 24 Aug 2026 11:39:24 +0200https://flakm.com/posts/sqlx_caches_til/Mon, 24 Aug 2026 11:39:24 +0200https://flakm.com/posts/sqlx_caches_til/<p>Today I learned that <a href="https://docs.rs/sqlx/latest/sqlx/fn.query.html" class="external-link" target="_blank" rel="noopener"><code>sqlx::query()</code></a> prepares and caches sql statements transparently. The cache belongs to each <em>connection</em>, so a pool does not have one shared statement cache — it has one per connection. With <code>max_connections: 40</code>, a statement that is warm on one connection is cold on the other 39.</p> <p>Caching is on by default, and for PostgreSQL each connection keeps up to 100 distinct statements in an LRU keyed by the SQL text. The capacity is configurable:</p>