Is it possible to reduce the MongoDB memory usage?

I am undergoing testing with 64-bit MongoDB. If I configure large size backups then the MongoDB memory utilization seems to be high.

Is there any possibility to reduce the m开发者_运维技巧emory utilization by MongoDB.

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Is it ideal that MongoDB is using 150 MB memory?

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Update /etc/security/limits.conf

Add a line as below:

@mongodb - rss 33554432

and then save the file.

It will take effects right away.

In this example, we assign 32GB memory usage for mongodb group users

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For Windows it seems possible to control the amount of memory MongoDB uses, see this tutorial at Captain Codeman:

Limit MongoDB memory use on Windows without Virtualization

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Do you mean memory usage or disk space? If you are really talking about memory, then Mongo stores its data in memory-mapped files, giving the illusion of massive memory usage.

You will find more information here:

http://www.mongodb.org/display/DOCS/Checking+Server+Memory+Usage