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Re: (ITS#8431) LMDB: Access newly opened database from another transaction
This works as intended. Each transaction is atomic, and shall see
neither DBIs nor data which were committed after the transaction began.
Cross-txn mdb_dbi_open() is in any case hairy to get right, we screwed
it up several times before arriving at the now-obvious semantics.
An application can open and cache its DBIs in a separate startup
transaction, then commit it and start new transactions.