Mnesia dB size limits

Joel Reymont <>
Wed Aug 30 18:34:39 CEST 2006


I have a suspicion that when people mention that Mnesia is great with  
huge data sets they unintentionally forget to mention important  
details. My understanding is that call record databases are insert/ 
retrieve only or for the most part.

When people outside of the telco world ask about Mnesia they usually  
have MySQL, etc. in mind and wonder about insert/delete/update  
performance. My understanding at the moment is that Mnesia is not the  
best database for insert/update/delete, much less with huge databases.

Please correct me if I'm wrong!

On Aug 30, 2006, at 4:10 PM, Philip Robinson wrote:

> I was once writing a program that needed to retrieve events
> within a date/time range from an mnesia table, and found that it
> did not seem to be hitting the index.  It would scan the entire
> 1-million-plus records every query... dead slow.
>
> When I wanted to retrieve a specific event there was no noticable
> delay, but most of my queries were for a date/time range.
>
> I think the mnesia issues being mentioned on this list were to do
> with database recovery across nodes after a node failure...?

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