>
> > SQLite allows multiple readers OR a single writer to access the database
> simultaneously.
> From the SQLite doc, as long as no transaction is pending, other process
> can
> read or obtain reserved lock for write.
>

the docs say: "Locks are not acquired until the first read or write
operation. The first read operation against a database creates a SHARED lock
and the first write operation creates a RESERVED lock.".

So your only chance to have concurrent access from both processes only if
the first one starts transaction and does something innocent like
preparations with selects, temp tables and so on. Any UPDATE or INSERT will
lead to RESERVED lock and process B suspension with db access.

Max
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