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At: http://www.10gen.com/presentations/webinar/real-time-analytics-with-mongodb slide
“Pre-Aggregation“. What are:
metadata: {
date: '...'
site: '...'
}
hourly: {
"0": 2312,
"1": 271235
...
}
Are these arrays inside a document?
Yes, that’s a sample document from a collection, with arrays or hashes stored in attributes. There’s a great O’Reilly book that describes this technique (basically, nesting like that helps speed up searching within the document.):
http://shop.oreilly.com/product/0636920019893.do
Look for “Tip 26: Create hierarchical documents for faster scans”