Be careful recommending INPLACE DDL

[morgo]

From the MySQL skill:

Use online DDL (ALGORITHM=INPLACE) when possible; test on replicas first.

INPLACE blocks InnoDB purge (bug) and requires enough temporary space to run. When it runs out of space, it's not resumable.

There are only a subset of INPLACE operations which are safe. You can use a parser to find these (example), or if not, I would recommend against it.

No issues with INSTANT.