https://4f0a9a3b.wangpeng.pages.dev/en/tags/performance/Recent content in Performance on Zhuifeng NotesHugoenTue, 25 Aug 2026 00:00:00 +0000https://4f0a9a3b.wangpeng.pages.dev/en/tech/mysql/indexing/Tue, 25 Aug 2026 00:00:00 +0000https://4f0a9a3b.wangpeng.pages.dev/en/tech/mysql/indexing/<p>Indexes are the decisive factor for MySQL query performance. Understanding InnoDB&rsquo;s B+Tree index structure is the only way to write SQL that truly hits indexes.</p> <h2 id="btree-and-the-clustered-index">B+Tree and the Clustered Index </h2> <p>InnoDB organizes indexes with a B+Tree whose non-leaf nodes only store index keys for navigation, while all data lives in leaf nodes that are linked in a doubly-linked list, which is ideal for range scans.</p>