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Definitely, worth checking out! Much stable and fast.
Has anyone had any luck with Orient and large database?

I tried to use it with a 80,000,000 product database with about 60,000,000 updates a day (edges between sellers and products labeled by price) and it was unusable with the same sizing as a mySQL database that handled it easily.

It seemed great though. Especially since neo4j open source is quite restrictive (clustering is a commercial only feature not available in the OSS version).

I had the same problem with a fairly 50/50 read/update database, about 20M reads/20M updates a day. Brought it to it's knees. Postgres handled it no problem.
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I work with graphs all the time and I've never had any luck with any graph database. Graph databases seem to flagrantly waste resources, especially when importing data.

That said, I should find out if OrientDB's announced "tenfold" performance increase is enough.

If you could use mysql as a replacement doesn't that mean you didn't need a graph database to start with though?