>> I have a new repro of an ITS#8264-like situation, but with
>> input data and with slightly different results. Note that ITS#8264
>> was fixed with the dataset provided in that bug; this is a different
>> dataset and produces different results.
>> The referenced test runs twice: once with mdb_cursor_del and once with
>> Just like before, mdb_cursor_del performs correctly whereas mdb_del
>> corrupts the database. In this case, mdb_del incorrectly removes one
>> extra key (a key prefixed with 04000000000000003a...), and
>> incorrectly leaves 21 keys in place that should have been deleted
>> (those keys begin with 05000000000000003a...).
>> This last item is the primary difference between these two bugs.
>> Unlike ITS#8264, you do not need to remove the database in between
>> test runs in order to repro this issue, although the results are
>> still incorrect and will eventually cause a bus error.
> Thanks again for the excellent bug reports. Fixed now in git.
I should also note that this is not a sensible use case. mdb_del has to
construct a cursor to perform its work; if you already have a cursor open=
should just use mdb_cursor_del. mdb_del is meant for one-shot use and
much slower than mdb_cursor_del when used in an iteration.
Thanks for this information. I will make the change to use mdb_cursor_del =
when possible. There are a couple of circumstances where I do not currentl=
y have access to the cursor though and will need to use mdb_del (or mdb_put=
, for updates) inside of the cursor. I will look into passing the cursor u=
p to my higher-level API callers though...
Note that I just reported ITS#8300, which was found after making the switch=
to mdb_cursor_del (and after applying the fix for ITS#8299).
Michael Alyn Miller