- Background index creation (since v.1.4)
- Sharding (since v.1.6)
- More query operators (since v.1.6)
- Journaling (since v.1.8)
- Sparse and covered indexes (since v.1.8)
- Compact command to reduce disk usage
- Memory usage more efficient
- Concurrency improvements
- Index performance enhancements
- Replica sets are now more configurable and data center aware
- MapReduce improvements
- Authentication (since 2.0 for sharding and most database commands)
- Geospatial features introduced
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