Hello,
we have a situation where "BEGIN IMMEDIATE" unexpectedly returns SQLITE_ERROR
with message "cannot start a transaction within a transaction (1)".
We have multiple threads running which repeatedly do the following:
<create connection>
BEGIN IMMEDIATE
INSERT ...
INSERT ...
COMMIT
<close connection>
This means each thread is using its own connection so that no synchronization
is required nor performed.
Sometimes "BEGIN IMMEDIATE" fails with SQLITE_ERROR instead of the expected
SQLITE_BUSY.
The behavior is present since 3.17 up to latest 3.22. We did not see this with
earlier versions.
We are running on Windows x64 and SQLite is built from amalgamation with
SQLITE_THREADSAFE set to 2.
I am posting to get a confirmation that my understanding is correct and that
"BEGIN IMMEDIATE" should not return this error in this situation. In that case
we can also try to narrow down the change in 3.17 which causes the failure.
Thank you,
Detlef.
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