[erlang-questions] "Erlang plus BDB: Disrupting the Conventional Web Wisdom"
Ulf Wiger (TN/EAB)
Thu Oct 11 20:34:22 CEST 2007
Jack Orenstein wrote:
> Can anyone comment on how dets and BDB compare on performance,
> scalability, reliability, and utilities (e.g. bulk load,
> import/export, ...)
One thing dets has against it is that it is designed to
support both keys and data of any type - even mixed types
in the same table. This is fairly unusual, and a serious
impediment when speed is of the essence. For example,
the dets implementation can never know how large a given
object is before it starts reading it.
I think it would be interesting to consider the option
to add type restrictions to selected mnesia tables. This
could be used to optimize the disk storage, e.g. by
choosing BDB or some other back-end.
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