[erlang-questions] "Erlang plus BDB: Disrupting the Conventional Web Wisdom"

Ulf Wiger (TN/EAB) <>
Fri Oct 12 11:53:46 CEST 2007

Yes, but the dets rewrite suggested by Klacke surely
wouldn't have to affect Mnesia much? Obviously, the new
dets would have to consider BW compatibility...

With a more scalable dets (which doesn't have such bad
recovery times on large data sets), mnesia would
automatically benefit.

Ulf W

Dan Gudmundsson wrote:
> The problem is that it requires an amount of mnesia hacking to get it 
> right. I didn't like/include RDBMS approch because mnesia currently have
> such a lousy support for doing things like this. Plugins needs a major
> rewrite. Synapse cheated heavily, it worked for their purpose but wont 
> work in another setup.
> /Dan
> Torbjorn Tornkvist wrote:
>> Claes Wikstrom wrote:
>>> Damien Morton wrote:
>>>> Is there any reason why Mnesia couldnt use BDB instead of dets?
>>> It could, and that would indeed remedy one of the weak points of
>>> mnesia as of today, i.e. dets.
>>> Dets is a fine module, but it is certainly beginning to show
>>> its age. When it was written, 12 years ago, the 4G space limitation
>>> seemed as a minor issue.
>>> We need to do a dets rewrite which addresses the two issues
>>> of size and repair speed. Once those two issues are fixed, I think
>>> mnesia stands up just fine to the rest of the dbs out there. 
>> <wild idea>
>> Perhaps some of the companies that have an interest in this
>> could cough up funding for one person to do this?
>> </wild idea>
>> --Tobbe
>>> Until then
>>> Mnesia only rock if we're sure that the amount of data in our largest
>>> table is limited to a few Gig.
>>> BDB is certainly a fine DB, but don't forget it's really expensive
>>> unless you're whipping up a db backend for your local high school
>>> or some such.
>>> /klacke
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