Ahh, thanks for the explanation. This clears up something I didn't know about Mongo (next to nothing other than that the other commenters all seemed to indicate that it should not be used for writes).
Much more informative than a downvote.
Much more informative than a downvote.
What the comment you're responding to is saying is that when you aren't making many writes, you can afford to switch transactions on and have Mongo lock the whole database because the odds of having a read come in at the same moment are much lower than if you were making a write every second.