Wednesday, June 1, 2011

Mongo Capped Collections

We have a huge capped collection over here at that we're using for logging purposes. It's pretty great, except that it's so big that it's too slow to query, so
here's what you can do to get useful data out of the system:


Capped collections don't usually have an index, so they're not good for searching when they get large, (you set how big you want them), but they are in chronological order by default, so our little query will find the records between 10,000 to 10,300 which will correspond with an actual block of time.

It's not a bad way to get information out of the system, but beware, because the logs are always growing, you'll need to move your skip back relatively frequently.

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