MongoDB In-Memory Storage Engine Setup

As of version 3.0, MongoDB now supports several different storage engines. One of the engines available is an experimental “In Memory” engine.

Storage Engines

MongoDB automatically loads frequently-accessed data into memory using the default memory-mapped files storage engine (MMAP V1). If you are working with a relatively small amount of data, this on-disk storage engine will likely have your data loaded in memory anyway as part of your active working set.

As an aside, here’s a quick comparison of the two on-disk storage engines available in MongoDB 3.0.

More details are available here.

But developers have still been trying to find ways to force MongoDB into using purely in-memory storage for some time.

In-Memory Setup

On the Windows platform, here’s how to play with the new, experimental in-memory storage engine being officially developed by the MongoDB folks.

1. Create a folder to hold log, lock, and pid files

MongoDB still wants a location on disk for certain artifacts, even with an exclusively in-memory DB. So create a folder for that like so:

C:\>mkdir c:\data\mem  

2. MongoDB In-Memory Windows Service

Now, from the MongoDB “bin” folder, tell MongoDB to install an instance of itself as a Windows Service that will listen on port 27018 (just an example, the default is 27017) and use the experimental in-memory storage engine:

C:\Program Files\MongoDB\Server\3.0\bin>mongod --install --serviceName MongoDBInMem --serviceDisplayName MongoDBInMem --port 27018 --dbpath c:\data\mem --logpath c:\data\mem\log --pidfilepath c:\data\mem\memdb.pid --storageEngine inMemoryExperiment  

3. Start it Up

Now start the service like so:

C:\Program Files\MongoDB\Server\3.0\bin>net start MongoDBInMem  

Enjoy.

Original article @ mongodb in memory storage engine setup

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