[radicality]

Not OP but I’m familiar with the topic and run similar tooling on large clusters. By pause he probably means prevent it from starting on more databases and let whatever is inflight finish. For the second point, correct, your application needs to handle both schemas during transition. When that’s done, you can rip out the unneeded logic from your application.

[xenomachina]

> your application needs to handle both schemas during transition.

How is this typically done? Have a version number in the db? Have the app examine the schema with every transaction? Have the app assume old/new schema optimistically, and if that fails rollback and try with alt schema? Something else?