https://www.pistack.xyz/tags/migration/ Recent content in Migration on Pi Stack Hugo en-us Wed, 29 Apr 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-04-29-gh-ost-vs-pt-online-schema-change-vs-mariadb-online-ddl-zero-downtime-mysql-schema-migration-2026/ Wed, 29 Apr 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-04-29-gh-ost-vs-pt-online-schema-change-vs-mariadb-online-ddl-zero-downtime-mysql-schema-migration-2026/ <p>When your production MySQL database hits millions of rows, a simple <code>ALTER TABLE ADD COLUMN</code> can lock the table for hours — blocking all reads and writes. Zero-downtime schema migration tools solve this by rewriting the table in the background while serving traffic from the original table, then swapping them atomically.</p>