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Tag Archives: mongomapper

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 | Also tagged | Comments (0)
Aug
23
2010

MongoMapper, Development Mode, and Memory Leaks

If you’ve worked with MongoMapper for a while, you’ve probably noticed that in complex apps, there are horrific memory leaks in development that magically disappear in production mode. While this is all well and good, and it’s rather handy that things Just Work in production, don’t you wish you didn’t have to restart your app [...]

By Chris Heald | Posted in MongoDB, Performance, Ruby | Also tagged , , , | Comments (2)