But that makes me wonder: what about this sequence of events:
- Postgres running normally on /dev/sda and /dev/sdb.
- Update to table in /dev/sdb tablespace is committed but still exists in WAL.
- Postgres crashes (e.g. power failure).
- Postgres starts with /dev/sda only.
- Recovery needs to update table in /dev/sdb tablespace.
I assume bad things will happen in this case.
200% correct.
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