[erlang-questions] Mnesia vs. ets+dets
Mon Nov 10 08:19:37 CET 2014
Sorry, something seems to have happened to what I originally sent. So
this is essentially what got cut:
Those controls tell me what I needed to know about the original
question. Every 3 minutes to save seems reasonable, though I'd probably
want to increase the number of allowed writes without flush to 100,000.
But while looking things up I read some things that seemed to mean that
Mnesia wanted to either hold the entire database in memory (disc_copies)
or not hold any cache (disc_only_copies). This doesn't sound good, as
what I need is a cache of active records in RAM. I can still do this by
using disc_only_copies and using it to fill an ets table which I
occasionally flush to Mnesia, but this seems unexpectedly clumsy. Am I
reading the documentation incorrectly? I really don't expect to be able
to fit the entire table(s) into RAM.
On 11/09/2014 05:26 PM, Charles Hixson wrote:
> On 11/09/2014 12:56 PM, T Ty wrote:
>> I usually advocate using Mnesia because any schema you come up with
>> you will later want some form of fault tolerance and as Joe Armstrong
>> keeps harping, you can't do fault tolerance with one node.
> erlang-questions mailing list
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