If everyone is read-only then there should be no collisions. Read-
locks and write-locks are different. A write-lock prevents everyone
else from reading or writing. A read-lock prevents anyone else from
writing but allows any number of other readers.

This is true for schema reads and writes too, like reading for the
presence of a given table. If some other process has a write lock on
the master schema table (adding or removing tables) then the read will
fail.

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