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Monthly Archives: July 2011

Jul
17
2011

MongoDB, count() and the big O

MongoDB, as I’ve mentioned before, is not without its warts. I’ve run into another, and it’s a nasty one. It turns out that if you perform count() on a query cursor that includes any conditions, even if those conditions are indexed, the operation takes O(n) time to run. In practice, I’ve found that this costs [...]

By Chris Heald | Posted in MongoDB, Performance, Ruby | Tagged , | Comments (0)
Jul
15
2011

Resque and Tests

Resque is a bucket of awesome slathered in a delicious candy coating. It makes background job work really, *really* easy. I recently switched to it, and found that in the process of testing it, I was generating an awful lot of extra unfulfilled jobs in my queue, when the job was a side-effect of some [...]

By Chris Heald | Posted in Rails, Ruby | Tagged | Comments (0)
Jul
12
2011

MongoDB: Warts and wobbles

I’m a huge fan of MongoDB – after years in MySQL, Interbase, and Postgres SQL databases, it was quite a breath of fresh air to get to try a document database on for size. I’ve more or less adopted it as my default data store for web applications, due to a number of awesome features [...]

By Chris Heald | Posted in MongoDB | Comments (3)