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I don't get this:

* When to not use DuckDB: Multiple concurrent processes reading from a single writable database*

So no concurrent reads? Or is it no concurrent reads while writing?

the latter - you can either have multiple concurrent readers or a single writer. see https://duckdb.org/faq.html#how-does-duckdb-handle-concurren....

What if I run multiple processes? One is to write, the rest are reads?