[erlang-questions] ets+dets

[Anders Ramsell]

Vlad Dumitrescu wrote:
> Hi all,
>
> I need to implement a simple key-value store that should be persistent 
> (on disk) but have a fast in-memory cache for the recently used 
> entries (possibly with a configurable policy) and with little 
> concurrent access. I was thinking of an ets+dets combo, but it may be 
> tricky to get the details right. Is there something like this out 
> there? Would it be better to just use mnesia? I'd like to keep it 
> lean, but if third-party databases fit the bill, I will look at them.
>
In our system we have a few cases that "combine" ets and dets in roughly 
this way:
- on startup the process fills the ets table with all contents of the 
dets table
- write is done in both ets and dets
- read is done from ets only

Perhaps not so good if there are a lot of writes but that is not the 
case where we do this.

/Anders