Laravel Tech Community

Jul 5, 2020 · Databases

Understanding Auto‑Increment Gaps with REPLACE INTO and INSERT … ON DUPLICATE KEY UPDATE in MySQL

This article examines why MySQL auto‑increment primary keys can jump unexpectedly when using REPLACE INTO or INSERT … ON DUPLICATE KEY UPDATE, explains the role of innodb_autoinc_lock_mode, demonstrates examples, and offers practical solutions to prevent uncontrolled ID growth.