https://www.chenk.top/en/tags/innodb/Recent content in InnoDB on Chen Kai BlogHugoenMon, 22 Apr 2024 09:00:00 +0000https://www.chenk.top/en/databases/04-storage-engines/Mon, 22 Apr 2024 09:00:00 +0000https://www.chenk.top/en/databases/04-storage-engines/<p>Every SQL statement you write eventually becomes bytes written to a disk. The component responsible for this translation — the storage engine — determines your database&rsquo;s performance characteristics more than almost any other factor. Two tables with identical schemas and identical data can perform wildly differently depending on the storage engine underneath. Understanding this layer explains <em>why</em> databases behave the way they do.</p> <hr> <h2 id="the-basics-pages-extents-and-tablespaces" class="heading-anchor">The Basics: Pages, Extents, and Tablespaces<a href="#the-basics-pages-extents-and-tablespaces" class="heading-link" aria-label="Permalink to this section" title="Copy link to this section">#</a> </h2><p>Databases do not read or write individual rows from disk. Disk I/O operates on <strong>pages</strong> (also called blocks), typically 4 KB, 8 KB, or 16 KB.</p>