[ Thanks to swetna
for this link. ]
“MongoDB wasn’t designed in a lab. We built MongoDB from our own
experiences building large scale, high availability, robust
systems. We didn’t start from scratch, we really tried to figure
out what was broken, and tackle that. So the way I think about
MongoDB is that if you take MySql, and change the data model from
relational to document based, you get a lot of great features:
embedded docs for speed, manageability, agile development with
schema-less databases, easier horizontal scalability because joins
aren’t as important. There are lots of things that work great in
relational databases: indexes, dynamic queries and updates to name
a few, and we haven’t changed much there. For example, the way you
design your indexes in MongoDB should be exactly the way you do it
in MySql or Oracle, you just have the option of indexing an
embedded field.”