> 10.05.2014 14:03, Vlad Khorsun wrote:
>> As for A-B-A
>> updates i see no problem as there will be 3 separate index entries with own
>> tx numbers. Currently we also have 3 index entires for such scenario, btw.
>> Old IB's optimization to not store existing key second time is not working in
>> concurrent environment and easy allows to have missing entries. It was
>> disabled in FB 2.0.
>
> If I'm not mistaken, these repeating index entries works as a reference
> counters and
Nope. A-A...A-B will produce two index entries
> allow to stop using staying list for indexes even in current code for the
> same reason as
> for blobs: three versions are enough for decision making.
Not really. While A-B-A is not possible for blobs (as we agreed recently),
but it is usual
case for index keys.
Regards,
Vlad
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