Memory management scenario with MongoDB & Node.JS -

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i'm implementing medium scale marketing e-commerce affiliation site, has following estimates,

total size of data: 5 - 10 gb indexes on data: 1 gb approx (which wanted in memory) disk size (fast i/o): 20-25 gb memory: 2 gb app development: node.js  working set estimation of query: average 1-2 kb, maximum 20-30 kb of text base article

i'm trying understand whether mongodb right choice database or not. index going downsize of memory have noticed after querying mongodb, has occupied memory (size of result set) caching query. in 8 hours i'm expecting queries' depth cover 95% of data, in scenario how mongodb manage limited memory scenario app instance of node.js running on same server.

would mongodb right choice scenario or should go other json based no-sql databases.


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