On my last post, Jaime asked: How the whole “Hacker News MongoDB random bashing” situation was dealt with from inside? There is a lot of MongoDB-hate out there, and I guess that it has to be difficult from an emotional point of view (especially when so many silly comments are made) What I found the […]
Part of MongoDB’s company philosophy was not to trash-talk any of our competitors, no matter what. If we were asked, we should describe what the other solutions’ strengths and weaknesses were, and what good use cases would be. My coworkers researched the other databases out there and gave presentations on them, so we’d all be […]
I was helping a MongoDB user with sharding one time. His chunks weren’t splitting and I was trying to diagnose the issue. His shard key looked reasonable, he didn’t have any errors in his log, and manually splitting the chunks worked. Finally, I looked at how much data he was storing: only a few MB […]
Or at least the writing it, it still has to be tech edited, “real” edited, illustrated, formatted, etc. The second edition is going to be about 400 pages (almost twice the length of the first edition), with majorly expanded sections on sharding, replication, and server administration. Phew. Now, some mea culpas: To those of you […]
Here are some exercises to battle-test your MongoDB instance before going into production. You’ll need a Database Master (aka DM) to make bad things happen to your MongoDB install and one or more players to try to figure out what’s going wrong and fix it. This was going to go into MongoDB: The Definitive Guide, […]
Suppose that the collection test.foo contained the following documents: {"x": -5} {"x": 0} {"x": 5} {"x": 10} {"x": [0, 5]} {"x": [-5, 10]} {"x": [-5, 5, 10]} x is some combination of -5, 0, 5, and 10 in each document. Which documents would db.foo.find({“x” : {“$gt” : -1, “$lt” : 6}}) return? Click here to […]
I’m really happy to share that, in a coordinated effort, all official MongoDB drivers are changing their defaults to return a response from writes today. I think that this is kind of a turning point: MongoDB is finally “newbie safe.” You can just spin up a mongod and it’ll default to journaling being on. Then […]
I just hit 300 pages! (O’Reilly has a nice system where it automatically compiles my XML into a PDF, so I can obsessively check page count). The last edition topped out at just over 200 pages, which was nice: you could actually sit down and read the thing in a reasonable amount of time and […]
I was working on a section on the gooey innards of journaling for The Definitive Guide, but then I realized it’s an implementation detail that most people won’t care about. However, I had all of these nice diagrams just laying around. Good idea, Patrick! So, how does journaling work? Your disk has your data files […]
10gen is hiring a lot of people straight out of college, so I thought this guide would be useful. Basically, the idea is: you have found and fixed a bug (so you’ve cloned the mongo repository, created a branch named SERVER-1234, and committed your change on it). You’ve had your fix code-reviewed (this page is […]
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