What does H2's on-disk format look like, and how does that tie-in with 
crash resilience? Could a power outage or JVM crash result in torn pages 
being written and the entire database refusing to launch afterwards (or 
spending hours processing WAL entries, uncertain about when or even if 
it'll ever finish)?

I really like MySQL's MyISAM in that respect. Yes you'll lose some data 
with it if it crashes and there's no WAL and no ACID and no nothing, but at 
the same time you'll only be losing a few rows around the affected spots 
rather than the entire table, because MyISAM doesn't use pages. How does H2 
compare to this?

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