[Haskell-cafe] Datomic-like db for Haskell?

[Paul Brauner]

Would you mind sharing the result of your research with the mailing list
once you're done?

On Sat, Dec 24, 2016 at 4:50 PM Ovidiu Deac <ovidiudeac at gmail.com> wrote:

> I'll do some research to evaluate my options. So far I have:
>
> Homegrown implementation on top of some DB (Riak/Postgres/Mongo...)
> https://github.com/agentm/project-m36
> https://hackage.haskell.org/package/filestore
>
> Thanks for the answers!
>
>
> On Fri, Dec 23, 2016 at 8:07 PM, Ertugrul Söylemez <esz at posteo.de> wrote:
>
> >>   * Another option is to run an insertion-only relational model on
> >>     really any database system you want like PostgreSQL.  There is
> >>     nothing about preserving history that needs special handling to be
> >>     efficient.
> >
> > I assume that some sort of structural sharing is needed once the
> > collections grow above a certain size. Also some support for caching
> > would be nice.
>
> Yeah, sharing could improve disk usage and cache utilisation.  I'm not
> aware of any DBMS-side sharing features in systems I have used
> (PostgreSQL and SQLite mainly).  The usual way to get sharing in
> relational systems is to normalise the schema.  That also allows you to
> use domain-specific knowledge to get even better sharing.
>
> Caching is of course supported, at least by PostgreSQL.  It aims to keep
> as much of the database in memory as possible (or as you tell it to).
>
>
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