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So how does it work in practice? 1. You upgrade postgres, and the new on-disk format isn't compatible with the old one. 2. You upgrade mysql, and the new on-d

by nodata 15y ago

So how does it work in practice? 1. You upgrade postgres, and the new on-disk format isn't compatible with the old one. 2. You upgrade mysql, and the new on-disk format IS compatible with the old one, but the new version has a bug that you keep hitting. You want to downgrade without losing all the transactions that you've accrued since the upgrade.

jamespo 15y ago
You use backups and do proper testing in a staging environment
- nodata 15y ago
  Which kind of negates the benefits of this feature.
  - bensummers 15y ago
    ... for databases. But for other kernel level things, eg drivers, it's great.