I definitely recommend the Postgres backend for your application. It will be a significant amount of tricky work to get BDB replication + distributed transactions to work cleanly with Elephant. Not worth the time / bug risks I think. It should be trivial to migrate.
Henrik, with the caching you (or was it Alex?) put in, real world apps may perform just fine. I suspect BDB would have a performance edge as object slot reads that miss in the cache would be satisfied with a local disk seek vs. a network transaction and remote disk seek. I wouldn't consider distributed BDB until you hit a wall with Postgres and felt that 2x performance was a material benefit. Ian On May 5, 2011, at 3:10 AM, Lukas Georgieff wrote: > Hi, > > we have been developing our application always on top of BDB, so it would be > nice to get running it in the mentioned scenario with BDB. > But seems that we've to rethink and test our app with postgres! > > > Best regards, > > Lukas > > > > > Date: Thu, 5 May 2011 12:01:40 +0200 > > From: hen...@evahjelte.com > > To: elephant-devel@common-lisp.net > > Subject: Re: [elephant-devel] using one store with mutiple lisp instances > > > > > Has anybody of you any idea or clue that could help us to use elephant > > > with > > > Berkeley DB in the mentioned scenario, maybe an additional framework, etc. > > > that could handle the locking of the shared db? > > > > > > > I am curious why the postgres backend is so unpopular. As far as I > > know there is no real data to support that it is slow in "real world" > > applications. Just running the testcases and measuring total time is > > not a very good performance test. It also has caching mechanisms that > > work in multi-process applications. For an application running on > > several computer is think network performance might be a bottleneck, > > why should berkeley db have an edge in that case? > > > > /Henrik Hjelte > > > > _______________________________________________ > > elephant-devel site list > > elephant-devel@common-lisp.net > > http://common-lisp.net/mailman/listinfo/elephant-devel > _______________________________________________ > elephant-devel site list > elephant-devel@common-lisp.net > http://common-lisp.net/mailman/listinfo/elephant-devel
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