I expect to have much more read accesses than write.
I use AutoCommit => 0, so immediate transactions are used by default. But you made me go through SQLite's documentation (again) : since the DB cannot be read at all while locked for writing, I'll have to deal with SQLITE_BUSY.
In the end, usability will depend mostly on the DB/schema design (fast or slow updates). I'll stick to SQLite for now since I don't have any real-case metrics.
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