[erlang-questions] Index Overhead In Mnesia
Tue Jun 10 19:03:52 CEST 2008
> So, if I understand you correctly, what I conclude is that the index
> performance degrades when you have lots of identical keys.
> Do you know why this is the case?
> Does the index perhaps maintain a list of values for each key and
> hence the set of values has to be updated continuously?
> If so, is this a bug or a feature?
It is a long standing "feature" of mnesia secondary indexes. It is one
that I also ran into a few weeks into my use of Erlang/mnesia.
I guess it is in the same category as repeated queue scanning for
selective receive - easy to workaround in most cases, so no major
incentive to change the behaviour.
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