Tag: online-ddl

All the articles with the tag "online-ddl".

• Altering a big table online: ADD column with near-zero downtime on MySQL 8+ and Postgres 14+

  Updated: 21 May, 2026

  A practical, cloud-agnostic look at adding columns to large tables without downtime — what MySQL 8+ and Postgres 14+ actually let you do, the expand-contract pattern that beats native DDL alone, the OSS tools, and the managed-service caveats.