Does Mongo DB have an In-Memory mode?

Question

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Embedded MongoDB when running integration tests

I want to use In-Memory mode for unit test, is there an in In-Memory mode like RavenDB?

There is no in-memory mode. See this question for some ideas about testing: http://stackoverflow.com/questions/6437226/embedded-mongodb-when-running-integration-tests — Eve Freeman, Apr 04 '12 at 06:11
Yes, there is now: https://docs.mongodb.com/manual/core/inmemory/ — Irwin, Sep 23 '16 at 04:11

score 31 · Accepted Answer · edited Jul 04 '14 at 08:26

31

There is no in-memory mode for MongoDB. As per this link, this feature won't be included until at least MongoDB 2.8.

Though since it's using Memory-mapped IO, it should be as speedy as in-memory during the actual processing. Not the startup though.

Also, there's a hack to use RAM disk drive and put your mongo db there. That way it would be entirely in memory.

edited Jul 04 '14 at 08:26

Ben McCann

answered Apr 04 '12 at 06:14

Dmitry Reznik

RAM drive is something I'd use for time being too, nowadays setting up one is really easy independent of your OS. – Esko Apr 04 '12 at 06:28
does it mean that RAM mode works for mongodb now? – alvas Sep 18 '14 at 19:54
check this link out: http://edgystuff.tumblr.com/post/49304254688/how-to-use-mongodb-as-a-pure-in-memory-db-redis – Anand Rockzz Mar 29 '15 at 15:55
5

You can run MongoDB 3 with in memory storageEngine: mongod --dbpath path_to_folder --storageEngine=inMemoryExperiment – Gerardo Hernandez Jul 13 '15 at 16:57
1

another side note related to this, is that folder still has to exist, because it tosses a couple files (eg. mongod.lock) in there. – CasualT Dec 28 '15 at 20:05

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