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In batches
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sqlite is really fast. I'm surprised it's only a million.
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It's running on an M1 mac with synchronous full. Wouldn't surprise me if it's possible to get higher numbers.
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Except this source code is not using :memory: The linked source code has

    (defonce db
      (d/init-db! "db/db.db"
        {:pool-size 4 :pragma {:synchronous "FULL"}}))
That's writing to disk.
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Yes it's writing to disk (on a M1 mac which has terribly slow fsync). But, because of the transaction the fsync dance is done once per batch. Each row is the id + a 50 byte data blob.

There's only one index so there's no real write amplification. The numbers will go down as you add more data and indexes.

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