In the realm of PostgreSQL database management, schema modifications are key. Enter pg_osc, a game-changer for executing schema changes without major downtime or database locks. This tool is perfect for crucial structural adjustments, from adding columns to altering data types. The process involves creating a shadow table mirroring the main table, copying data, and seamlessly swapping tables. pg_osc reduces downtime, allows continuous operations during schema changes, and optimizes database performance. Notably, it supports adding, dropping, or renaming columns without data loss. Overall, pg_osc is essential for efficient PostgreSQL schema changes, providing a smooth transition and ensuring data consistency.
https://www.mydbops.com/blog/postgresql-schema-changes-with-pg_osc/