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MongoDB and datasets that don't fit in RAM no matter how hard you shove

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http://serverfault.com – This is very system dependent, but chances are near certain we'll scale past some arbitrary cliff and get into Real Trouble. I'm curious what kind of rules-of-thumb exist for a good RAM to Disk-space ratio. We're planning our next round of systems, and need to make some choices regarding RAM, SSDs, and how much of each the new nodes will get. But now for some performance details! During normal workflow of a single project-run, MongoDB is hit with a very high percentage of writes (70-80%). Once the second stage of the processing pipeline hits, it's extremely high read as it needs to deduplica (HowTos)

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Submitted by xskl on 07/16/2012 – Made popular on 07/16/2012

Stories similar to MongoDB and datasets that don't fit in RAM no matter how hard you shove

I am new to Mongodb and EC2. If I use following single MongoDb server :

High-Memory Extra Large Instance 17.1 GiB memory, 6.5 ECU (2 virtual cores with 3.25 EC2 Compute Units each), 420 GB of local instance storage, 64-bit platform

As a layman, if we quantify I/O, data in MB/sec.

MongoDB is this great database I hear about.

MongoDB (from "humongous") is an open source document-oriented NoSQL database system.MongoDB is part of the NoSQL family of database systems.

We have two MongoDB data nodes (replica set) - Primary & Secondary. I noticed that the non-mapped virtual memory is relatively high and wondering if they are hurting our MongoDB performance (The server usually peaked at around 6-7K queries per sec).

So I need to extend a disk for one of our ubuntu machines. The VM has 4 disks. The problem is, I dont know which disk is what partition.

Say that I have /med/mongoDB and /med/mongoDB-backup Both of them are exactly the same size. 400GB.

I need to extend /med/mongoDB .

I have a fast Windows 7 PC with 8Gb RAM. I want to test this MongoDB replica set: http://www.mongodb.org/display/DOCS/Replica+Sets for my development. I dont want to buy 3 PCs though, as it's kind of expensive. Is there a way to use some kind of technology, like Hyper-V, to be able to set it up? If not, how many PC and what kind should I buy?

I installed MongoDB in an Ubuntu Server VM inside VMware using these instructions: http://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/. Everything works fine, and I can access MongoDB at the regular port 27017

./mongo 172.16.150.131:27017

Now, I want to make a dummy replica set and another db instance for testing my app.

We set up a MongoDB development server on CentOS 6.3 and were able to separate different projects by using separate config files and rc scripts. Now we're looking at setting up a MongoDB production environment.

I've read that it is not recommended to host multiple instances of MongoDB on the same server in production.

Unable to install in mongodb 14 weeks 6 days ago

I am tring to install mongodb but its getting failed again and again. I am getting following error:

mongodb is not found.

I using following command to install mongodb:

sudo apt-get install mongodb